* * * READ ME * * *
               * * * Symantec Volume Manager 6.1.1 * * *
                      * * * Patch 6.1.1.400 * * *
                         Patch Date: 2016-04-21


This document provides the following information:

   * PATCH NAME
   * OPERATING SYSTEMS SUPPORTED BY THE PATCH
   * PACKAGES AFFECTED BY THE PATCH
   * BASE PRODUCT VERSIONS FOR THE PATCH
   * SUMMARY OF INCIDENTS FIXED BY THE PATCH
   * DETAILS OF INCIDENTS FIXED BY THE PATCH
   * INSTALLATION PRE-REQUISITES
   * INSTALLING THE PATCH
   * REMOVING THE PATCH


PATCH NAME
----------
Symantec Volume Manager 6.1.1 Patch 6.1.1.400


OPERATING SYSTEMS SUPPORTED BY THE PATCH
----------------------------------------
AIX 6.1 ppc
AIX 7.1 ppc


PACKAGES AFFECTED BY THE PATCH
------------------------------
VRTSvxvm


BASE PRODUCT VERSIONS FOR THE PATCH
-----------------------------------
   * Symantec Dynamic Multi-Pathing 6.1
   * Symantec Storage Foundation 6.1
   * Symantec Storage Foundation Cluster File System HA 6.1
   * Symantec Storage Foundation for Oracle RAC 6.1
   * Symantec Storage Foundation HA 6.1
   * Symantec Volume Manager 6.1


SUMMARY OF INCIDENTS FIXED BY THE PATCH
---------------------------------------
Patch ID: 6.1.1.400
* 3607232 (3596330) 'vxsnap refresh' operation fails with `Transaction aborted waiting for IO 
drain` error
* 3640641 (3622068) After mirroring encapsulated root disk, rootdg fails to import if any disk in 
the disk group becomes unavailable.
* 3674567 (3636089) VVR(Veritas Volume Replicator) secondary was panicked due to a bad mutex 
produced by vxconfigd while committing the transactions.
* 3682022 (3648719) The server panics while adding or removing LUNs or HBAs.
* 3729172 (3726110) On systems with high number of CPUs, Dynamic Multi-Pathing (DMP) devices may perform considerably slower than OS device paths.
* 3736352 (3729078) VVR(Veritas Volume Replication) secondary site panic occurs during patch 
installation because of flag overlap issue.
* 3778391 (3565212) IO failure is seen during controller giveback operations 
on Netapp Arrays in ALUA mode.
* 3808593 (3795788) Performance degrades when many application sessions open the same data file on the VxVMvolume.
* 3808846 (3169854) Enabling  DMP (Dynamic Multi-Pathing) native support fails on some AIX TL levels due to boot image size limit.
* 3812272 (3811946) When invoking "vxsnap make" command with cachesize option to create space optimized snapshot, the command succeeds but a plex I/O error message is displayed in syslog.
* 3852147 (3852146) Shared DiskGroup(DG) fails to import when "-c" and "-o noreonline" options 
are
specified together
* 3852800 (3819670) When smartmove with 'vxevac' command is run in background by hitting 'ctlr-z' key and 'bg' command, the execution of 'vxevac' is terminated abruptly.
* 3854390 (3853049) The display of stats delayed beyond the set interval for vxstat and multiple 
sessions of vxstat impacted the IO performance.
* 3856384 (3525490) System panic occurs when partial data received by VVR for incorrect type casting.
* 3857121 (3857120) Oracle database process hangs when being stopped.
* 3858065 (3858063) VxVM (Veritas Volume Manager) should support the maximum 3072 CPUs on AIX 
server.
* 3864112 (3860503) Poor performance of vxassist mirroring is observed on some high end servers.
* 3864625 (3599977) During a replica connection, referencing a port that is already deleted in another thread causes a system panic.
* 3864628 (3686698) vxconfigd was getting hung due to deadlock between two threads
* 3864980 (3594158) The spinlock and unspinlock are referenced to different objects when interleaving with a kernel transaction.
* 3864986 (3621232) The vradmin ibc command cannot be started or executed on Veritas Volume Replicators (VVR) secondary node.
* 3864987 (3513392) Reference to replication port that is already deleted caused panic.
* 3864988 (3625890) vxdisk resize operation on CDS disks fails with an error message of "Invalid
attribute specification"
* 3864989 (3521726) System panicked for double freeing IOHINT.
* 3865415 (3736502) Memory leakage is found when transaction aborts.
* 3865631 (3564260) VVR commands are unresponsive when replication is paused and resumed in a loop.
* 3865633 (3721565) vxconfigd hang is seen.
* 3865640 (3749557) System hangs because of high memory usage by vxvm.
* 3865653 (3795739) In a split brain scenario, cluster formation takes very long time.
* 3866241 (3790136) File system hang observed due to IO's in Ditry Region Logging (DRL).
* 3866623 (3486920) DMP should set ODM attribute reserve_policy=no_reserve when 
disabling MPIO for pid using vxmpio utility
* 3866625 (3593174) On restoring mksysb system image on the same disk of the 
same system, VxVM Secondary swap space becomes inactive.
* 3866628 (3564204) Some of the paging space characteristics cannot be changed if you use the System
Management Interface Tool (SMIT) with  Change /Show characteristics of VxVM
page space option.
* 3866643 (3539548) After adding removed MPIO disk back, 'vxdisk list' or 'vxdmpadm listctlr all' 
commands may show duplicate entry for DMP node with error state.
* 3866651 (3596282) Snap operations fail with error "Failed to allocate a new map due to no free 
map available in DCO".
* 3867134 (3486861) Primary node panics when storage is removed while replication is going on with heavy 
IOs.
* 3867137 (3674614) Restarting the vxconfigd(1M) daemon on the slave (joiner) node during node-join
operation may cause the vxconfigd(1M) daemon to become unresponsive on the
master and the joiner node.
* 3867138 (3748862) 'vxmpio' should handle a case when devices are busy such as rootvg devices.
* 3867315 (3672759) The vxconfigd(1M) daemon may core dump when DMP database is corrupted.
* 3867353 (3657235) With multiple Veritas Volume Manager(VxVM) paging spaces
configured on a system, smit menu "Change /Show characteristics of VxVM page
space" shows incorrect characteristics for some of the paging spaces.
* 3867706 (3645370) vxevac command fails to evacuate disks with Dirty Region Log(DRL) plexes.
* 3867709 (3767531) In Layered volume layout with FSS configuration, when few 
of the FSS_Hosts are rebooted, Full resync is happening for non-affected disks 
on master.
* 3867710 (3788644) Reuse raw device number when checking for available raw devices.
* 3867711 (3802750) VxVM (Veritas Volume Manager) volume I/O-shipping functionality is not disabled even after the user issues the correct command to disable it.
* 3867712 (3807879) User data corrupts because of the writing of the backup EFT GPT disk label 
during the VxVM disk-group flush operation.
* 3867714 (3819832) No syslog message seen when dmp detects controller 
disabled/enabled
* 3867881 (3867145) When VVR SRL occupation > 90%, then output the SRL occupation is shown by 10 
percent.
* 3869659 (3868444) Disk header timestamp is updated even if the disk group(DG) import fails.
* 3874736 (3874387) Disk header information is not logged to the syslog 
sometimes even if the disk is missing and dg import fails.
* 3874961 (3871750) In parallel VxVM vxstat commands report abnormal disk IO statistic data
* 3875230 (3554608) Mirroring a volume on 6.1 creates a larger plex than the original.
* 3875564 (3875563) While dumping the disk header information, human readable
timestamp was not converted correctly from corresponding epoch time.
Patch ID: 6.1.1.000
* 3372831 (2573229) On RHEL6, the server panics when Dynamic Multi-Pathing (DMP) executes 
PERSISTENT RESERVE IN command with REPORT CAPABILITIES service action on 
powerpath controlled device.
* 3440232 (3408320) Thin reclamation fails for EMC 5875 arrays.
* 3457363 (3462171) When SCSI-3 persistent reservation command 'ioctls' are
issued on non-SCSI devices, dmpnode gets disabled.
* 3470255 (2847520) The resize operation on a shared linked-volume can cause data corruption on the target volume.
* 3470260 (3415188) I/O hangs during replication in Veritas Volume Replicator (VVR).
* 3470262 (3077582) A Veritas Volume Manager (VxVM) volume may become inaccessible causing the read/write operations to fail.
* 3470265 (3326964) VxVM hangs in Clustered Volume Manager (CVM) environments in the presence of FMR operations.
* 3470270 (3403390) After a crash, the linked-to volume goes into NEEDSYNC state.
* 3470272 (3385753) Replication to the Disaster Recovery (DR) site hangs even
though Replication links (Rlinks) are in the connected state.
* 3470274 (3373208) DMP wrongly sends the SCSI PR OUT command with APTPL bit value as A0A to arrays.
* 3470275 (3417044) System becomes unresponsive while creating a VVR TCP 
connection.
* 3470279 (3300418) VxVM volume operations on shared volumes cause unnecessary read I/Os.
* 3470282 (3374200) A system panic or exceptional IO delays are observed while executing snapshot operations, such as, refresh.
* 3470290 (2999871) The vxinstall(1M) command gets into a hung state when it is
invoked through Secure Shell (SSH) remote execution.
* 3470291 (3350077) VxVM doesnAt shrink actively used vxvm secondary paging device properly.
* 3470293 (3367997) System panics during LUN removal operations.
* 3470300 (3340923) For Asymmetric Logical Unit Access (ALUA) array type Logical Unit Numbers (LUN), Dynamic Multi-Pathing (DMP) disables and enables the unavailable asymmetric access state paths on I/O load.
* 3470301 (2812161) In a Veritas Volume Replicator (VVR) environment, after the Rlink is detached, 
the vxconfigd(1M) daemon on the secondary host may  hang.
* 3470303 (3314647) The vxcdsconvert(1M)command fails with error: Plex column offset is not strictly increasing for column/plex.
* 3470322 (3399323) The reconfiguration of Dynamic Multipathing (DMP) database fails.
* 3470345 (3281004) For DMP minimum queue I/O policy with large number of CPUs a couple of issues 
are observed.
* 3470347 (3444765) In Cluster Volume Manager (CVM), shared volume recovery may take long time for large configurations.
* 3470350 (3437852) The system panics when Symantec Replicator Option goes to
PASSTHRU mode.
* 3470352 (3450758) The slave node was not able to join CVM cluster and resulted in panic.
* 3470353 (3236772) Heavy I/O loads on primary sites result in
transaction/session timeouts between the primary and secondary sites.
* 3470354 (3446415) A pool may get added to the file system when the file system
shrink operation is performed on FileStore.
* 3470382 (3368361) When site consistency is configured within a private disk group and CVM is up,
the reattach operation of a detached site fails.
* 3470383 (3455460) The vxfmrshowmap and verify_dco_header utilities fail with an error.
* 3470384 (3440790) The vxassist(1M) command with parameter mirror and the vxplex command(1M) with parameter att hang.
* 3470385 (3373142) Updates to vxassist and vxedit man pages for behavioral
changes after 6.0.
* 3490147 (3485907) Panic occurs in the I/O code path.
* 3506679 (3435225) In a given CVR setup, rebooting the master node causes one of
the slaves to panic.
* 3506707 (3400504) Upon disabling the host side Host Bus Adapter (HBA) port,
extended attributes of some devices are not seen anymore.
* 3506709 (3259732) In a CVR environment, rebooting the primary slave followed by connect-disconnect
in loop causes rlink to detach.
* 3531570 (3511067) Absence of storage key permission in the error handling code path results in a node panic.
* 3531906 (3526500) Disk IO failures occur with DMP IO timeout error messages when DMP (Dynamic Multi-pathing) IO statistics demon is not running.
* 3536289 (3492062) Dynamic Multi-Pathing (DMP) fails to get page 0x83 LUN identifier for EMC symmetrix LUNS and continuously logs error messages.
* 3540122 (3482026) The vxattachd(1M) daemon reattaches plexes of manually detached site.
* 3543944 (3520991) The vxconfigd(1M) daemon dumps core due to memory corruption.
Patch ID: 6.1.0.100
* 3444900 (3399131) For PowerPath (PP) enclosure, both DA_TPD and DA_COEXIST_TPD flags are set.
* 3445234 (3358904) System with ALUA enclosures sometimes panics during path fault scenarios
* 3446126 (3338208) writes from fenced out node on Active-Passive (AP/F) shared storage device fail
with unexpected error
* 3447306 (3424798) Veritas Volume Manager (VxVM) mirror attach operations
(e.g., plex attach, vxassist mirror, and third-mirror break-off snapshot
resynchronization) may take longer time under heavy application I/O load.
* 3447894 (3353211) A. After EMC Symmetrix BCV (Business Continuance Volume) device switches to
read-write mode, continuous vxdmp (Veritas Dynamic Multi Pathing) error messages
flood syslog.
B. DMP metanode/path under DMP metanode gets disabled unexpectedly.
* 3449714 (3417185) Rebooting host, after the exclusion of a dmpnode while I/O is in progress on it, leads to vxconfigd core dump.
* 3452709 (3317430) The vxdiskunsetup utility throws error after upgradation from 
5.1SP1RP4.
* 3452727 (3279932) The vxdisksetup and vxdiskunsetup utilities were failing on
disk which is part of a deported disk group (DG), even if "-f" option is specified.
* 3452811 (3445120) Change tunable VOL_MIN_LOWMEM_SZ value to trigger early readback.
* 3455455 (3409612) The value of reclaim_on_delete_start_time cannot be set to
values outside the range: 22:00-03:59
* 3456729 (3428025) System running Symantec Replication Option (VVR) and configured as VVR primary crashes when heavy parallel I/Os load are issued
* 3458036 (3418830) Node boot-up is getting hung while starting vxconfigd
* 3458799 (3197987) vxconfigd dumps core, when 'vxddladm assign names file=<filename>' is executed and the file has one or more invalid values 
for enclosure vendor ID or product ID.
* 3470346 (3377383) The vxconfigd crashes when a disk under Dynamic Multi-pathing
(DMP) reports device failure.


DETAILS OF INCIDENTS FIXED BY THE PATCH
---------------------------------------
This patch fixes the following Symantec incidents:

Patch ID: 6.1.1.400

* 3607232 (Tracking ID: 3596330)

SYMPTOM:
'vxsnap refresh' operation fails with following indicants:

Errors occur from DR (Disaster Recovery) Site of VVR (Veritas 
Volume Replicator):

o	vxio: [ID 160489 kern.notice] NOTICE: VxVM vxio V-5-3-1576 commit: 
Timedout waiting for rvg [RVG] to quiesce, iocount [PENDING_COUNT] msg 0
o	vxvm:vxconfigd: [ID 702911 daemon.warning] V-5-1-8011 Internal 
transaction failed: Transaction aborted waiting for io drain

At the same time, following errors occur from Primary Site of VVR:

vxio: [ID 218356 kern.warning] WARNING: VxVM VVR vxio V-5-0-267 Rlink 
[RLINK] disconnecting due to ack timeout on update message

DESCRIPTION:
VM (Volume Manager) Transactions on DR site get aborted as pending IOs could 
not be drained in stipulated time leading to failure of FMR (Fast-Mirror 
Resync) 'snap' operations. These IOs could not be drained because of IO 
throttling. A bug/race in conjunction with timing in VVR causes a miss in 
clearing this throttling condition/state.

RESOLUTION:
Code changes have been done to fix the race condition which ensures clearance 
of throttling state at appropriate time.

* 3640641 (Tracking ID: 3622068)

SYMPTOM:
After mirroring encapsulated root disk, rootdg fails to import if any disk in 
the disk group becomes unavailable.
It causes system becoming unbootable if /usr is mounted on a separate disk and 
is also encapsulated.

DESCRIPTION:
Starting from VxVM(Veritas Volume Manager) 6.1, by default all non-detached 
disks within a disk group should be accessible to the system so that the disk 
group can be successfully imported. It impacts system boot with alternative 
encapsulated boot disk when original encapsulated boot disk is unavailable.

RESOLUTION:
Code changes have been made to skip such check when trying to import rootdg.

* 3674567 (Tracking ID: 3636089)

SYMPTOM:
VVR secondary was panicked while committing the transactions with the following 
stack:
vpanic()
vol_rv_sec_write_childdone+0x18()
vol_rv_transaction_prepare+0x63c()
vol_commit_iolock_objects+0xbc()
vol_ktrans_commit+0x2d8()
volsioctl_real+0x2ac()

DESCRIPTION:
While unwinding updates in vol_rv_transaction_prepare(), double SIO(Staged IO) 
done happens result of panic.

RESOLUTION:
Code changes were made to fix the issue.

* 3682022 (Tracking ID: 3648719)

SYMPTOM:
The server panics with a following stack trace while adding or removing LUNs or HBAs: 
dmp_decode_add_path()
dmp_decipher_instructions()
dmp_process_instruction_buffer()
dmp_reconfigure_db()
gendmpioctl()
vxdmpioctl()

DESCRIPTION:
While deleting a dmpnode, Dynamic Multi-Pathing (DMP) releases the memory associated with the dmpnode structure. 
In case the dmpnode doesn't get deleted for some reason, and if any other tasks access the freed memory of this dmpnode, then the server panics.

RESOLUTION:
The code is modified to avoid the tasks from accessing the memory that is freed by the dmpnode, which is deleted. The change also fixed the memory leak issue in the buffer allocation code path.

* 3729172 (Tracking ID: 3726110)

SYMPTOM:
On systems with high number of CPUs, DMP devices may perform  considerably slower than OS device  paths.

DESCRIPTION:
In high CPU configuration, I/O statistics related functionality in DMP takes more CPU time because DMP statistics are collected on per CPU basis. This stat collection happens in DMP I/O code path hence it reduces the I/O performance. Because of this, DMP devices perform slower than OS device paths.

RESOLUTION:
The code is modified to remove some of the stats collection functionality from DMP I/O code path. Along with this, the following tunable need to be turned off: 
1. Turn off idle lun probing. 
#vxdmpadm settune dmp_probe_idle_lun=off
2. Turn off statistic gathering functionality.  
#vxdmpadm iostat stop

Notes: 
1. Please apply this patch if system configuration has large number of CPU and if DMP performs considerably slower than OS device paths. For normal systems this issue is not applicable.

* 3736352 (Tracking ID: 3729078)

SYMPTOM:
In VVR environment, the panic may occur after SF(Storage Foundation) patch 
installation or uninstallation on the secondary site.

DESCRIPTION:
VXIO Kernel reset invoked by SF patch installation removes all Disk Group 
objects that have no preserved flag set, because the preserve flag is overlapped 
with RVG(Replicated Volume Group) logging flag, the RVG object won't be removed, 
but its rlink object is removed, result of system panic when starting VVR.

RESOLUTION:
Code changes have been made to fix this issue.

* 3778391 (Tracking ID: 3565212)

SYMPTOM:
While performing controller giveback operations on NetApp ALUA arrays, the 
below messages are observed in /etc/vx/dmpevents.log

[Date]: I/O error occured on Path <path> belonging to Dmpnode <dmpnode>
[Date]: I/O analysis done as DMP_PATH_BUSY on Path <path> belonging to 
Dmpnode 
<dmpnode>
[Date]: I/O analysis done as DMP_IOTIMEOUT on Path <path> belonging to 
Dmpnode 
<dmpnode>

DESCRIPTION:
During the asymmetric access state transition, DMP puts the buffer pointer 
in the delay queue based on the flags observed in the logs. This delay 
resulted in timeout and thereby filesystem went into disabled state.

RESOLUTION:
DMP code is modified to perform immediate retries instead of putting the 
buffer pointer in the delay queue for transition in progress case.

* 3808593 (Tracking ID: 3795788)

SYMPTOM:
Performance degradation is seen when many application sessions open the same data file on Veritas Volume Manager (VxVM) volume.

DESCRIPTION:
This issue occurs because of the lock contention. When many application sessions open the same data file on the VxVM volume,  the exclusive lock is occupied on all CPUs. If there are a lot of CPUs in the system, this process could be quite time- consuming, which leads to performance degradation at the initial start of applications.

RESOLUTION:
The code is modified to change the exclusive lock to the shared lock when  the data file on the volume is open.

* 3808846 (Tracking ID: 3169854)

SYMPTOM:
On some AIX TL levels, following error messages display when DMP native support is enabled:
	VxVM vxdmpadm ERROR V-5-1-16951 boot image size exceeding the system 
limit, trying to recover
	VxVM vxdmpadm ERROR V-5-1-16952 system recovery successful, but DMP 
support for LVM bootability could not be enabled
It can also stop AIX bootup procedure, displaying below message on the console:
	PReP-BOOT : Unable to load full PReP image

DESCRIPTION:
On some AIX TL levels, the default boot image size is large. When DMP native support is enabled, the boot image size exceeds AIX limit of 32MB. As a result, the system cannot  boot up.

RESOLUTION:
The code is modified to significantly decrease DMP component size in AIX boot image when DMP native support is enabled.

* 3812272 (Tracking ID: 3811946)

SYMPTOM:
When invoking "vxsnap make" command with cachesize option to create space optimized snapshot, the command succeeds but the following error message is displayed in syslog:

kernel: VxVM vxio V-5-0-603 I/O failed.  Subcache object <subcache-name> does 
not have a valid sdid allocated by cache object <cache-name>.
kernel: VxVM vxio V-5-0-1276 error on Plex <plex-name> while writing volume 
<volume-name> offset 0 length 2048

DESCRIPTION:
When space optimized snapshot is created using "vxsnap make" command along with cachesize option, cache and subcache objects are created by the same command. During the creation of snapshot, I/Os from the volumes may be pushed onto a subcache even though the subcache ID has not yet been allocated. As a result, the I/O fails.

RESOLUTION:
The code is modified to make sure that I/Os on the subcache are 
pushed only after the subcache ID has been allocated.

* 3852147 (Tracking ID: 3852146)

SYMPTOM:
Shared DiskGroup fails to import when "-c" and "-o noreonline" options are
specified together with the below error:

VxVM vxdg ERROR V-5-1-10978 Disk group <dgname>: import failed:
Disk for disk group not found

DESCRIPTION:
When "-c" option is specified we update the DISKID and DGID of the disks in 
the DG. When the
information about the disks in the DG is passed to Slave node, slave node 
does not 
have the latest information since the online of the disks would not happen
because of "-o noreonline" being specified. Now since slave node does not 
have
the latest 
information, it would not be able to identify proper disks belonging to the 
DG
which leads to DG import failing with "Disk for disk group not found".

RESOLUTION:
Code changes have been done to handle the working of "-c" and "-o 
noreonline"
together.

* 3852800 (Tracking ID: 3819670)

SYMPTOM:
When smartmove with 'vxevac' command is run in background by hitting 'ctlr-z' key and 'bg' command, the execution of 'vxevac' is terminated abruptly.

DESCRIPTION:
As part of "vxevac" command for data movement, VxVM submits the data as a task in the kernel, and use select() primitive on the task file descriptor to wait for task finishing events to arrive. When "ctlr-z" and bg is used to run vxevac in background, the select() returns -1 with errno EINTR. VxVM wrongly interprets it as user termination action and hence vxevac is terminated.  
Instead of terminating vxevac, the select() should be retried untill task completes.

RESOLUTION:
The code is modified so that when select() returns with errno EINTR, it checks whether vxevac task is finished. If not, the select() is retried.

* 3854390 (Tracking ID: 3853049)

SYMPTOM:
On a server with more number CPUs, the stats output of vxstat is delayed beyond 
the set interval. Also multiple sessions of vxstat is impacting the IO 
performance.

DESCRIPTION:
The vxstat acquires an exclusive lock on each CPU in order to gather the stats. 
This would affect the consolidation and display of stats in an environment with 
huge number of CPUs and disks. The output of stats for interval of 1 second can 
get delayed beyond the set interval. Also the acquisition of lock happens in 
the IO path which would affect the IO performance due contention of these locks.

RESOLUTION:
The code modified to remove the exclusive spin lock.

* 3856384 (Tracking ID: 3525490)

SYMPTOM:
In VVR (Veritas Volume Replication) environment, system panic with the following 
stack,

#0 crash_kexec at ffffffff800b1509
#1 __die at ffffffff80065137
#2 do_page_fault at ffffffff80067430
#3 error_exit at ffffffff8005ddf9
    [exception RIP: nmcom_wait_msg+449]
#4 nmcom_server_proc at ffffffff889f04b6 [vxio]

DESCRIPTION:
While VVR sending messages with UDP, it uses different data structure with TCP. In 
case of receiving partial data, the message is explicitly typecast to the same 
structure for both TCP and UDP. This will cause some pointers in UDP message header 
become invalid and panic the system while copying data.

RESOLUTION:
Code changes have been made to fix the problem.

* 3857121 (Tracking ID: 3857120)

SYMPTOM:
After stopping Oracle database process, this process does not run Oracle 
database again but it hangs there.

DESCRIPTION:
Two threads from VxVM(Veritas Volume Manager) trying to asynchronously 
manipulate the per-cpu data structures for I/O counting, which causes to a race 
condition that might make I/O count leaking, hence the volume cant be closed 
and results in the process hang.

RESOLUTION:
VxVM code has been changed to avoid the race condition happening.

* 3858065 (Tracking ID: 3858063)

SYMPTOM:
VxVM may panic on any AIX servers with greater than 1024 CPUs.

DESCRIPTION:
Current VxVM code only supports maximum 1024 CPUs, while the maximum CPUs on 
Power 8 server could be 3072, then it may panic when try to use the CPUs 
greater than 1024.

RESOLUTION:
VxVM code has been changed to support maximum 3072 CPUs on AIX.

* 3864112 (Tracking ID: 3860503)

SYMPTOM:
Poor performance of vxassist mirroring is observed compared to using raw dd
utility to do mirroring .

DESCRIPTION:
There is huge lock contention on high end server with large number of cpus,
because doing copy on each region needs to obtain some unnecessary cpu locks.

RESOLUTION:
VxVM code has been changed to decrease the lock contention.

* 3864625 (Tracking ID: 3599977)

SYMPTOM:
During a replica connection, referencing a port that is already deleted in another thread causes a system panic with a similar stack trace as below:
.simple_lock()
soereceive()
soreceive()
.kernel_add_gate_cstack()
kmsg_sys_rcv()
nmcom_get_next_mblk()
nmcom_get_next_msg()
nmcom_wait_msg_tcp()
nmcom_server_proc_tcp()
nmcom_server_proc_enter()
vxvm_start_thread_enter()

DESCRIPTION:
During a replica connection, a port is created before increasing the count. This is to protect the port from getting deleted. However, another thread deletes the port before the count is increased and after the port is created. 
While the replica connection thread proceeds, it refers to the port that is already deleted, which causes a NULL pointer reference and a system panic.

RESOLUTION:
The code is modified to prevent asynchronous access to the count that is associated with the port by means of locks.

* 3864628 (Tracking ID: 3686698)

SYMPTOM:
vxconfigd was getting hung due to deadlock between two threads

DESCRIPTION:
Two threads were waiting for same lock causing deadlock between 
them. This will lead to block all vx commands. 
untimeout function will not return until pending callback is cancelled  (which 
is set through timeout function) OR pending callback has completed its 
execution (if it has already started). Therefore locks acquired by callback 
routine should not be held across call to untimeout routine or deadlock may 
result.

Thread 1: 
    untimeout_generic()   
    untimeout()
    voldio()
    volsioctl_real()
    fop_ioctl()
    ioctl()
    syscall_trap32()
 
Thread 2:
    mutex_vector_enter()
    voldsio_timeout()
    callout_list_expire()
    callout_expire()
    callout_execute()
    taskq_thread()
    thread_start()

RESOLUTION:
Code changes have been made to call untimeout outside the lock 
taken by callback handler.

* 3864980 (Tracking ID: 3594158)

SYMPTOM:
The system panics on a VVR secondary node with the following stack trace:
.simple_lock()
soereceive()
soreceive()
.kernel_add_gate_cstack()
kmsg_sys_rcv()
nmcom_get_next_mblk()
nmcom_get_next_msg()
nmcom_wait_msg_tcp()
nmcom_server_proc_tcp()
nmcom_server_proc_enter()
vxvm_start_thread_enter()

DESCRIPTION:
You may issue a spinlock or unspinlock to the replica to check whether to use a checksum in the received packet. During the lock or unlock operation, if there is a transaction that is being processed with the replica, which rebuilds the replica object in the kernel, then there is a possibility that the replica referenced in spinlock is different than the one which the replica has referenced in unspinlock (especially when the replica is referenced through several pointers). As a result, the system panics.

RESOLUTION:
The code is modified to set the flag in the port attribute to indicate whether to use the checksum during a port creation. Hence, for each packet that is received, you only need to check the flag in the port attribute rather than referencing it to the replica object. As part of the change, the spinlock or unspinlock statements are also removed.

* 3864986 (Tracking ID: 3621232)

SYMPTOM:
When the vradmin ibc command is executed to initiate the In-band Control (IBC) procedure, the vradmind (VVR daemon) on VVR secondary node goes into the disconnected state. Due to which, the following IBC procedure or vradmin ibc commands cannot be started or executed on VVRs secondary node and a message similar to the following appears on  VVRs primary node:
    
VxVM VVR vradmin ERROR V-5-52-532 Secondary is undergoing a state transition. Please re-try the command after some time.
VxVM VVR vradmin ERROR V-5-52-802 Cannot start command execution on Secondary.

DESCRIPTION:
When IBC procedure runs into the commands finish state, the vradmin on VVR secondary node goes into a disconnected state, which the vradmind on primary node fails to realize. 
In such a scenario, the vradmind on primary refrains from sending a handshake request to the secondary node which can change the primary nodes state from disconnected to running. As a result, the vradmind in the primary node continues to be in the disconnected state and the vradmin ibc command fails to run on the VVR secondary node despite of being in the running state on the VVR primary node.

RESOLUTION:
The code is modified to make sure the vradmind on VVR primary node is notified while it goes into the disconnected state on VVR secondary node. As a result, it can send out a handshake request to take the secondary node out of the disconnected state.

* 3864987 (Tracking ID: 3513392)

SYMPTOM:
secondary panics when rebooted while heavy IOs are going on primary

PID: 18862  TASK: ffff8810275ff500  CPU: 0   COMMAND: "vxiod"
#0 [ffff880ff3de3960] machine_kexec at ffffffff81035b7b
#1 [ffff880ff3de39c0] crash_kexec at ffffffff810c0db2
#2 [ffff880ff3de3a90] oops_end at ffffffff815111d0
#3 [ffff880ff3de3ac0] no_context at ffffffff81046bfb
#4 [ffff880ff3de3b10] __bad_area_nosemaphore at ffffffff81046e85
#5 [ffff880ff3de3b60] bad_area_nosemaphore at ffffffff81046f53
#6 [ffff880ff3de3b70] __do_page_fault at ffffffff810476b1
#7 [ffff880ff3de3c90] do_page_fault at ffffffff8151311e
#8 [ffff880ff3de3cc0] page_fault at ffffffff815104d5
#9 [ffff880ff3de3d78] volrp_sendsio_start at ffffffffa0af07e3 [vxio]
#10 [ffff880ff3de3e08] voliod_iohandle at ffffffffa09991be [vxio]
#11 [ffff880ff3de3e38] voliod_loop at ffffffffa0999419 [vxio]
#12 [ffff880ff3de3f48] kernel_thread at ffffffff8100c0ca

DESCRIPTION:
If the replication stage IOs are started after serialization of the replica volume, 
replication port  could be deleted  and set to NULL during handling the replica 
connection changes,  this will cause the panic since we have not checked if the 
replication port is still valid before referencing to it.

RESOLUTION:
Code changes have been done to abort the stage IO if replication port is NULL.

* 3864988 (Tracking ID: 3625890)

SYMPTOM:
After running the vxdisk resize command, the following message is displayed: 
"VxVM vxdisk ERROR V-5-1-8643 Device <disk name> resize failed: Invalid 
attribute specification"

DESCRIPTION:
Two reserved cylinders for special usage for CDS (Cross-platform Data Sharing)
VTOC(Volume Table of Contents) disks. In case of expanding a disk with
particular disk size on storage side, VxVM(Veritas Volume Manager) may calculate
the cylinder number as 2, which causes the vxdisk resize fails with the error
message of "Invalid attribute specification".

RESOLUTION:
The code is modified to avoid the failure of resizing a CDS VTOC disk.

* 3864989 (Tracking ID: 3521726)

SYMPTOM:
When using Symantec Replication Option, system panic happens while freeing
memory with the following stack trace on AIX,

pvthread+011500 STACK:
[0001BF60]abend_trap+000000 ()
[000C9F78]xmfree+000098 ()
[04FC2120]vol_tbmemfree+0000B0 ()
[04FC2214]vol_memfreesio_start+00001C ()
[04FCEC64]voliod_iohandle+000050 ()
[04FCF080]voliod_loop+0002D0 ()
[04FC629C]vol_kernel_thread_init+000024 ()
[0025783C]threadentry+00005C ()

DESCRIPTION:
In certain scenarios, when a write IO gets throttled or un-winded in VVR, we
free the memory related to one of our data structures. When we restart this IO,
the same memory gets illegally accessed and freed again even though it was
freed.It causes system panic.

RESOLUTION:
Code changes have been done to fix the illegal memory access issue.

* 3865415 (Tracking ID: 3736502)

SYMPTOM:
When FMR is configured in VVR environment, 'vxsnap refresh' fails with below 
error message:
"VxVM VVR vxsnap ERROR V-5-1-10128 DCO experienced IO errors during the
operation. Re-run the operation after ensuring that DCO is accessible".
Also, multiple messages of connection/disconnection of replication 
link(rlink) are seen.

DESCRIPTION:
Inherently triggered rlink connection/disconnection causes the transaction 
retries. During transaction, memory is allocated for Data Change Object(DCO) 
maps and is not cleared on abortion of a transaction.
This leads to a problem of memory leak and eventually to exhaustion of maps.

RESOLUTION:
The fix has been added to clear the allocated DCO maps when transaction 
aborts.

* 3865631 (Tracking ID: 3564260)

SYMPTOM:
VVR commands are unresponsive when replication is paused and resumed in a loop.

DESCRIPTION:
While Veritas Volume Replicator (VVR) is in the process of sending updates then pausing a replication is deferred until acknowledgements of updates are received or until an error occurs. For some reason, if the acknowledgements get delayed or the delivery fails, the pause operation continues to get deferred resulting in unresponsiveness.

RESOLUTION:
The code is modified to resolve the issue that caused unresponsiveness.

* 3865633 (Tracking ID: 3721565)

SYMPTOM:
vxconfigd hang is seen with below stack.
genunix:cv_wait_sig_swap_core
genunix:cv_wait_sig_swap 
genunix:pause
unix:syscall_trap32

DESCRIPTION:
In FMR environment, write is done on a source volume having space-optimized(SO) 
snapshot. Memory is acquired first and then ILOCKs are acquired on individual SO 
volumes for pushed writes. On the other hand, a user write on SO snapshot will first 
acquire ILOCK and then acquire memory. This causes deadlock.

RESOLUTION:
Code is modified to resolve deadlock.

* 3865640 (Tracking ID: 3749557)

SYMPTOM:
System hangs and becomes unresponsive because of heavy memory consumption by 
vxvm.

DESCRIPTION:
In the Dirty Region Logging(DRL) update code path an erroneous condition was
present that lead to an infinite loop which keeps on consuming memory. This leads
to consumption of large amounts of memory making the system unresponsive.

RESOLUTION:
Code has been fixed, to avoid the infinite loop, hence preventing the hang which
was caused by high memory usage.

* 3865653 (Tracking ID: 3795739)

SYMPTOM:
In a split brain scenario, cluster formation takes very long time.

DESCRIPTION:
In a split brain scenario, the surviving nodes in the cluster try to preempt the keys of nodes leaving the cluster. If the keys have been already preempted by one of the surviving nodes, other surviving nodes will receive UNIT Attention. DMP (Dynamic Multipathing) then retries the preempt command after a delayof 1 second if it receives Unit attention. Cluster formation cannot complete untill PGR keys of all the leaving nodes are removed from all the disks. If the number of disks are very large, the preemption of keys takes a lot of time, leading to the very long time for cluster formation.

RESOLUTION:
The code is modified to avoid adding delay for first couple of retries when reading PGR keys. This allows faster cluster formation with arrays that clear the Unit Attention condition sooner.

* 3866241 (Tracking ID: 3790136)

SYMPTOM:
File system hang can be observed sometimes due to IO's hung in DRL.

DESCRIPTION:
There might be some IO's hung in DRL of mirrored volume due to incorrect 
calculation of outstanding IO's on volume and number of active IO's which are 
currently in progress on DRL. The value of the outstanding IO on volume can get 
modified incorrectly leading to IO's on DRL not to progress further which in 
turns results in a hang kind of scenario.

RESOLUTION:
Code changes have been done to avoid incorrect modification of value of 
outstanding IO's on volume and prevent the hang.

* 3866623 (Tracking ID: 3486920)

SYMPTOM:
After disabling MPIO(AIX Multipath I/O) thus enabling DMP (Veritas Dynamic 
Multipathing) support using vxmpio command, 'reserve_policy' attribute for 
devices is not getting set due to which I/O commands fail on some paths.
#lsattr -El <disk_name> -a reserve_policy
lsattr: 0514-528 The "reserve_policy" attribute does not exist in the predefined 
device configuration database.

DESCRIPTION:
After disabling MPIO using vxmpio command for the hdisk devices, 
'reserve_policy' attribute is not getting set. If AIX does not find 
'reserve_policy' attribute for a device then the device is getting opened in 
'SINGLE PATH RESERVE mode'. This causes SCSI-2 reservation 
to be set through one of the paths and hence I/O commands fail on other paths.

RESOLUTION:
'reserve_policy' PdAt ODM entry has been added explicitly when disabling MPIO 
using vxmpio command.

* 3866625 (Tracking ID: 3593174)

SYMPTOM:
When a system image, created using aix mksysb utility, is restored 
on same disk of same system, VxVM secondary swap space, which was configured 
and active at the time the image was taken, goes in inactive state. The swap 
space doesnt get activated even after subsequent reboots unless activated 
manually.

DESCRIPTION:
VxVM swap space configuration data is stored in ODM databases
and in some VxVM specific configuration files. System image, taken by aix
specific utility mksysb, backs up and restores ODM database entries and some
other configuration data for the local swap spaces only, which are parts of root
volume group and not for VxVM swap spaces. Thus, when the mksysb image, having
an active VxVM swap space on the system, is taken and restored on the same disk
of the same system, configuration data required by VxVM page space is not
available. Hence VxVM swap space is not activated automatically.

RESOLUTION:
Code changes are done in vxvm startup script to activate the 
VxVM swap spaces configured in the system.

* 3866628 (Tracking ID: 3564204)

SYMPTOM:
If you edit characteristics of VxVM page space to activate it on every system
reboot by using AIX SMIT 'Change /Show
characteristics of VxVM page space' option, it fails with the following error:

VxVM vxvm ERROR V-5-2-0 Please specify VxVM-pagespace
USAGE: chps -t vxvm [ -c ChksumSize] [ -s no_of_blocks | -d no_of_blocks ] [
-a
{ y | n } ] VxVM-PSname
chps: Error executing the helper executable vxvm.
chps: Cannot change paging space swapvol1.

DESCRIPTION:
When you use the AIX SMIT with 'Change /Show characteristics of VxVM page space'
option to change the characteristics of VxVM paging space so that it will be
activated on every reboot,  it fails. This is because incorrect Oracle Disk
Manager (ODM) entries will get added in the SMIT ODM database. This causes
execution of wrong command resulting failure.

RESOLUTION:
The code has been changed to add ODM entry in SMIT ODM database so that
correct command gets executed.

* 3866643 (Tracking ID: 3539548)

SYMPTOM:
Adding MPIO(Multi Path I/O) disk that had been removed earlier may result in 
following two issues:
1. 'vxdisk list' command shows duplicate entry for DMP (Dynamic Multi-Pathing) 
node with error state.
2. 'vxdmpadm listctlr all' command shows duplicate controller names.

DESCRIPTION:
1. Under certain circumstances, deleted MPIO disk record information is left in 
/etc/vx/disk.info file with its device number as -1 but its DMP node name is 
reassigned to other MPIO disk. When the deleted disk is added back, it is 
assigned the same name, without validating for conflict in the name. 
2. When some devices are removed and added back to the system, we are adding a 
new controller for each and every path that we have discovered. This leads to 
duplicated controller entries in DMP database.

RESOLUTION:
1. Code is modified to properly remove all stale information about any disk 
before updating MPIO disk names. 
2. Code changes have been made to add the controller for selected paths only.

* 3866651 (Tracking ID: 3596282)

SYMPTOM:
FMR (Fast Mirror Resync) operations fail with error "Failed to allocate a new 
map due to no free map available in DCO".
 
"vxio: [ID 609550 kern.warning] WARNING: VxVM vxio V-5-3-1721
voldco_allocate_toc_entry: Failed to allocate a new map due to no free map
available in DCO of [volume]"

It often leads to disabling of the snapshot.

DESCRIPTION:
For instant space optimized snapshots, stale maps are left behind for DCO (Data 
Change Object) objects at the time of creation of cache objects. So, over the 
time if space optimized snapshots are created that use a new cache object, 
stale maps get accumulated, which eventually consume all the available DCO 
space, resulting in the error.

RESOLUTION:
Code changes have been done to ensure no stale entries are left behind.

* 3867134 (Tracking ID: 3486861)

SYMPTOM:
Primary node panics with below stack when storage is removed while replication is 
going on with heavy IOs.
Stack:
oops_end 
no_context 
page_fault 
vol_rv_async_done 
vol_rv_flush_loghdr_done 
voliod_iohandle 
voliod_loop

DESCRIPTION:
In VVR environment, when write to data volume failson primary node, error handling 
is initiated. As a part 
of it, SRL header will be flushed. As primary storage is removed, flushing will 
fail. Panic will be hit as 
invalid values will be accessed while logging error message.

RESOLUTION:
Code is modified to resolve the issue.

* 3867137 (Tracking ID: 3674614)

SYMPTOM:
Restarting the vxconfigd(1M) daemon on the slave (joiner) node during node-join
operation  may cause the vxconfigd(1M) daemon to become unresponsive on the
master and the joiner node.

DESCRIPTION:
When vxconfigd(1M) daemon is restarted in the middle of the node join process,
it wrongly assumes that this is a slave rejoin case, and sets the rejoin flag.
Since the rejoin flag is wrongly set, the import operation of the disk groups on
the slave node fails, and the join process is not terminated smoothly. As a
result, the vxconfigd(1M) daemon becomes unresponsive on the master and the
slave node.

RESOLUTION:
The code is modified to differentiate between the rejoin scenario and the
vxconfigd(1M) daemon restart scenario.

* 3867138 (Tracking ID: 3748862)

SYMPTOM:
When vxmpio does not handle a case for busy devices with respect to rootvg and 
it throws below error.  
	Method error (/usr/lib/methods/ucfgdevice):
        		0514-062 Cannot perform the requested function because the
                 	specified device is busy.

DESCRIPTION:
vxmpio enable removes the corresponding devices, and if the devices are busy then 
it throws error.
This behavior was designed to perform proper cleanup of ODM entries and requires the 
applications to stop using the devices.
However, in case of rootvg the devices will always be busy since rootvg cannot be 
stopped. Hence, vxmpio should ignore busy errors.
This leaves some stale devices which should be cleaned up after reboot by the 
startup scripts.

RESOLUTION:
Code is modified to handle busy errors on rootvg devices.

* 3867315 (Tracking ID: 3672759)

SYMPTOM:
When a DMP database is corrupted, the vxconfigd(1M) daemon may core dump with the following stack trace:
database is corrupted.
  ddl_change_dmpnode_state ()
  ddl_data_corruption_msgs ()
  ddl_reconfigure_all ()
  ddl_find_devices_in_system ()
  find_devices_in_system ()
  req_change_state ()
  request_loop ()
  main ()

DESCRIPTION:
The issue is observed because the corrupted DMP database is not properly destroyed.

RESOLUTION:
The code is modified to remove the corrupted DMP database.

* 3867353 (Tracking ID: 3657235)

SYMPTOM:
When a system is configured with multiple VxVM paging spaces, smit
menu "Change /Show characteristics of VxVM page space" displays characteristics
of one of the paging space, irrespective of the given input. For other paging
spaces, the output displays wrong characteristics and such paging spaces cannot
be modified also.

DESCRIPTION:
In case of multiple VxVM paging spaces configured on the
system, because of incorrect ODM entries added to smit ODM database, the smit
menu only displays characteristics of one of the paging spaces, regardless of
the input given. Also, there can be multiple stale ODM entries for VxVM paging
spaces, because the entries are not deleted as a part of package removal. Hence,
in some case, wrong stale ODM entry is used by smit menu which causes the issue.

RESOLUTION:
The code is modified to parse the input correctly in order to
show the characteristics of VxVM paging spaces correctly based on the input
provided and to delete the stale ODM entries present on the system.

* 3867706 (Tracking ID: 3645370)

SYMPTOM:
After running the vxevac command, if the user tries to rollback or commit the evacuation for a disk containing DRL plex, the action fails with the following errors:

/etc/vx/bin/vxevac -g testdg  commit testdg02 testdg03
VxVM vxsd ERROR V-5-1-10127 deleting plex %1:
        Record is associated
VxVM vxassist ERROR V-5-1-324 fsgen/vxsd killed by signal 11, core dumped
VxVM vxassist ERROR V-5-1-12178 Could not commit subdisk testdg02-01 in 
volume testvol
VxVM vxevac ERROR V-5-2-3537 Aborting disk evacuation

/etc/vx/bin/vxevac -g testdg rollback testdg02 testdg03
VxVM vxsd ERROR V-5-1-10127 deleting plex %1:
        Record is associated
VxVM vxassist ERROR V-5-1-324 fsgen/vxsd killed by signal 11, core dumped
VxVM vxassist ERROR V-5-1-12178 Could not rollback subdisk testdg02-01 in 
volume
testvol
VxVM vxevac ERROR V-5-2-3537 Aborting disk evacuation

DESCRIPTION:
When the user uses the vxevac command, new plexes are created on the target disks. Later,  during the commit or roll back operation, VxVM deletes the plexes on the source or the target disks. 
For deleting a plex, VxVM should delete its sub disks first, otherwise the plex deletion fails with the following error message:
VxVM vxsd ERROR V-5-1-10127 deleting plex %1:
        Record is associated 
The error is displayed because the code does not handle the deletion of subdisks of plexes marked for DRL (dirty region logging) correctly.

RESOLUTION:
The code is modified to handle evacuation of disks with DRL plexes correctly.  .

* 3867709 (Tracking ID: 3767531)

SYMPTOM:
In Layered volume layout with FSS configuration, when few of the 
FSS_Hosts are rebooted, Full resync is happening for non-affected disks on 
master.

DESCRIPTION:
In configuration, where there are multiple FSS-Hosts, with 
layered volume created on the hosts. When the slave nodes are rebooted , few 
of the 
sub-volumes of non-affected disks are fully getting synced on master.

RESOLUTION:
Code-changes have been made to sync only needed part of sub-
volume.

* 3867710 (Tracking ID: 3788644)

SYMPTOM:
When DMP (Dynamic Multi-Pathing) native support enabled for Oracle ASM 
environment, if we constantly adding and removing DMP devices, it will cause error 
like:
/etc/vx/bin/vxdmpraw enable oracle dba 775 emc0_3f84
VxVM vxdmpraw INFO V-5-2-6157
Device enabled : emc0_3f84
Error setting raw device (Invalid argument)

DESCRIPTION:
There is a limitation (8192) of maximum raw device number N (exclusive) of 
/dev/raw/rawN. This limitation is defined in boot configuration file. When binding a 
raw 
device to a dmpnode, it uses /dev/raw/rawN to bind the dmpnode. The rawN is 
calculated by one-way incremental process. So even if we unbind the device later on, 
the "released" rawN number will not be reused in the next binding. When the rawN 
number is increased to exceed the maximum limitation, the error will be reported.

RESOLUTION:
Code has been changed to always use the smallest available rawN number instead of 
calculating by one-way incremental process.

* 3867711 (Tracking ID: 3802750)

SYMPTOM:
Once VxVM (Veritas Volume Manager) volume I/O-shipping functionality is turned on, it is not getting disabled even after the user issues the correct command to disable it.

DESCRIPTION:
VxVM (Veritas Volume Manager) volume I/O-shipping functionality is turned off by default. The following two commands can be used to turn it on and off:
	vxdg -g <dgname> set ioship=on
	vxdg -g <dgname> set ioship=off

The command to turn off I/O-shipping is not working as intended because I/O-shipping flags are not reset properly.

RESOLUTION:
The code is modified to correctly reset I/O-shipping flags when the user issues the CLI command.

* 3867712 (Tracking ID: 3807879)

SYMPTOM:
Writing the backup EFI GPT disk label during the disk-group flush 
operation may cause data corruption on volumes in the disk group. The backup 
label could incorrectly get flushed to the disk public region and overwrite the 
user data with the backup disk label.

DESCRIPTION:
For EFI disks initialized under VxVM (Veritas Volume Manager), it 
is observed that during a disk-group flush operation, vxconfigd (veritas 
configuration daemon) could stop writing the EFI GPT backup label to the volume 
public region, thereby causing user data corruption. When this issue happens, 
the real user data are replaced with the backup EFI disk label

RESOLUTION:
The code is modified to prevent the writing of the EFI GPT backup 
label during the VxVM disk-group flush operation.

* 3867714 (Tracking ID: 3819832)

SYMPTOM:
No syslog message seen when dmp detects controller disabled/enabled

DESCRIPTION:
Whenever there is action taken from Storage whether addtion or 
removal, DMP detects the events of failure or notifications of additions, and 
as 
prt of discovery it disables / enables the controller and message for this was 
not getting logged in syslog file.

RESOLUTION:
Code-changes made to show the syslog message for controller 
disable/enable event.

* 3867881 (Tracking ID: 3867145)

SYMPTOM:
When VVR SRL occupation > 90%, then output the SRL occupation is shown by 10 
percent.

DESCRIPTION:
This is kind of enhancement, to show the SRL Occupation when it's more than 
90% is previously shown with 10 percentage gap.
Here the enhancement is to show the logs with 1 percentage granularity.

RESOLUTION:
Changes are done to show the syslog messages wih 1 percent granularity, when 
SRL is filled > 90%.

* 3869659 (Tracking ID: 3868444)

SYMPTOM:
Disk header timestamp is updated even if the disk group import fails.

DESCRIPTION:
While doing dg import operation, during join operation disk header timestamps are updated. This makes difficult for 
support to understand which disk is having latest config copy if dg import is failed and decision is to be made if
force dg import is safe or not.

RESOLUTION:
Dump the old disk header timestamp and sequence number in the syslog which can be referred on deciding if force dg 
import would be safe or not

* 3874736 (Tracking ID: 3874387)

SYMPTOM:
Disk header information is not logged to the syslog sometimes
even if the disk is missing and dg import fails.

DESCRIPTION:
In scenarios where disk has config copy enabled
and get active disk record, then disk header information was not getting
logged even though the disk is missing thereafter dg import fails.

RESOLUTION:
Dump the disk header information even if the disk record is
active and attached to the disk group.

* 3874961 (Tracking ID: 3871750)

SYMPTOM:
In parallel VxVM(Veritas Volume Manager) vxstat commands report abnormal 
disk IO statistic data. Like below:
# /usr/sbin/vxstat -g <dg name> -u k -dv -i 1 -S
...... 
dm  emc0_2480                       4294967210 4294962421           -382676k  
4294967.38 4294972.17
......

DESCRIPTION:
After VxVM IO statistics was optimized for huge CPUs and disks, there's a 
race condition when multiple vxstat commands are running to collect disk IO 
statistic data. It causes disk's latest IO statistic value become smaller 
than previous one, hence VxVM treates the value overflow so that abnormal 
large IO statistic value is printed.

RESOLUTION:
Code changes are done to eliminate such race condition.

* 3875230 (Tracking ID: 3554608)

SYMPTOM:
Mirroring a volume on 6.1 creates a larger plex than the original.

DESCRIPTION:
when mirror a volume, VXVM should ignore the disk alignment and use the DG(Disk 
Group) alignment. After VXVM got all the configuration from user command, it 
didn't check whether disk alignment will be used. Since disk alignment isn't 
ignored, the length of the mirror will be based on disk alignment. Hence the 
issue.

RESOLUTION:
Code changes have been made to use the DG alignment instead of disk alignment 
when mirror a volume.

* 3875564 (Tracking ID: 3875563)

SYMPTOM:
While dumping the disk header information, human readable timestamp was
not converted correctly from corresponding epoch time.

DESCRIPTION:
When disk group import fails if one of the disk is missing while
importing the disk group, it will dump the disk header information the syslog.
But, human readable time stamp was not getting converted correctly from
corresponding epoch time.

RESOLUTION:
Code changes done to dump disk header information correctly.

Patch ID: 6.1.1.000

* 3372831 (Tracking ID: 2573229)

SYMPTOM:
On RHEL6, the server panics when Dynamic Multi-Pathing (DMP) executes 
PERSISTENT RESERVE IN command with REPORT CAPABILITIES service action on 
powerpath controlled device. The following stack trace is displayed:

enqueue_entity at ffffffff81068f09
enqueue_task_fair at ffffffff81069384
enqueue_task at ffffffff81059216
activate_task at ffffffff81059253
pull_task at ffffffff81065401
load_balance_fair at ffffffff810657b7
thread_return at ffffffff81527d30
schedule_timeout at ffffffff815287b5
wait_for_common at ffffffff81528433
wait_for_completion at ffffffff8152854d
blk_execute_rq at ffffffff8126d9dc
emcp_scsi_cmd_ioctl at ffffffffa04920a2 [emcp]
PowerPlatformBottomDispatch at ffffffffa0492eb8 [emcp]
PowerSyncIoBottomDispatch at ffffffffa04930b8 [emcp]
PowerBottomDispatchPirp at ffffffffa049348c [emcp]
PowerDispatchX at ffffffffa049390d [emcp]
MpxSendScsiCmd at ffffffffa061853e [emcpmpx]
ClariionKLam_groupReserveRelease at ffffffffa061e495 [emcpmpx]
MpxDefaultRegister at ffffffffa061df0a [emcpmpx]
MpxTestPath at ffffffffa06227b5 [emcpmpx]
MpxExtraTry at ffffffffa06234ab [emcpmpx]
MpxTestDaemonCalloutGuts at ffffffffa062402f [emcpmpx]
MpxIodone at ffffffffa0624621 [emcpmpx]
MpxDispatchGuts at ffffffffa0625534 [emcpmpx]
MpxDispatch at ffffffffa06256a8 [emcpmpx]
PowerDispatchX at ffffffffa0493921 [emcp]
GpxDispatch at ffffffffa0644775 [emcpgpx]
PowerDispatchX at ffffffffa0493921 [emcp]
GpxDispatchDown at ffffffffa06447ae [emcpgpx]
VluDispatch at ffffffffa068b025 [emcpvlumd]
GpxDispatch at ffffffffa0644752 [emcpgpx]
PowerDispatchX at ffffffffa0493921 [emcp]
GpxDispatchDown at ffffffffa06447ae [emcpgpx]
XcryptDispatchGuts at ffffffffa0660b45 [emcpxcrypt]
XcryptDispatch at ffffffffa0660c09 [emcpxcrypt]
GpxDispatch at ffffffffa0644752 [emcpgpx]
PowerDispatchX at ffffffffa0493921 [emcp]
GpxDispatch at ffffffffa0644775 [emcpgpx]
PowerDispatchX at ffffffffa0493921 [emcp]
PowerSyncIoTopDispatch at ffffffffa04978b9 [emcp]
emcp_send_pirp at ffffffffa04979b9 [emcp]
emcp_pseudo_blk_ioctl at ffffffffa04982dc [emcp]
__blkdev_driver_ioctl at ffffffff8126f627
blkdev_ioctl at ffffffff8126faad
block_ioctl at ffffffff811c46cc
dmp_ioctl_by_bdev at ffffffffa074767b [vxdmp]
dmp_kernel_scsi_ioctl at ffffffffa0747982 [vxdmp]
dmp_scsi_ioctl at ffffffffa0786d42 [vxdmp]
dmp_send_scsireq at ffffffffa078770f [vxdmp]
dmp_do_scsi_gen at ffffffffa077d46b [vxdmp]
dmp_pr_check_aptpl at ffffffffa07834dd [vxdmp]
dmp_make_mp_node at ffffffffa0782c89 [vxdmp]
dmp_decode_add_disk at ffffffffa075164e [vxdmp]
dmp_decipher_instructions at ffffffffa07521c7 [vxdmp]
dmp_process_instruction_buffer at ffffffffa075244e [vxdmp]
dmp_reconfigure_db at ffffffffa076f40e [vxdmp]
gendmpioctl at ffffffffa0752a12 [vxdmp]
dmpioctl at ffffffffa0754615 [vxdmp]
dmp_ioctl at ffffffffa07784eb [vxdmp]
dmp_compat_ioctl at ffffffffa0778566 [vxdmp]
compat_blkdev_ioctl at ffffffff8128031d
compat_sys_ioctl at ffffffff811e0bfd
sysenter_dispatch at ffffffff81050c20

DESCRIPTION:
Dynamic Multi-Pathing (DMP) uses PERSISTENT RESERVE IN command with the REPORT
CAPABILITIES service action to discover target capabilities. On RHEL6, system
panics unexpectedly when Dynamic Multi-Pathing (DMP) executes PERSISTENT 
RESERVE IN command with REPORT CAPABILITIES service action on powerpath 
controlled device coming from EMC Clarion/VNX array. This bug has been reported 
to EMC powperpath engineering.

RESOLUTION:
The Dynamic Multi-Pathing (DMP) code is modified to execute PERSISTENT RESERVE 
IN command with the REPORT CAPABILITIES service action to discover target 
capabilities only on non-third party controlled devices.

* 3440232 (Tracking ID: 3408320)

SYMPTOM:
Thin reclamation fails for EMC 5875 arrays with the following message:
# vxdisk reclaim <disk> 
Reclaiming thin storage on: 
Disk <disk> : Reclaim Partially Done. Device Busy.

DESCRIPTION:
As a result of recent changes in EMC Microcode 5875, Thin Reclamation for EMC
5875 arrays fails because reclaim request length exceeds the maximum
"write_same" length supported by the array.

RESOLUTION:
The code has been modified to correctly set the maximum "write_same" length of
the array.

* 3457363 (Tracking ID: 3462171)

SYMPTOM:
When SCSI-3 Persistent Reservation command ioctls are issued on
non-SCSI devices, dmpnode gets disabled with the following messages in the
system log: 
[..]
Mar 10 22:44:19 s40sb1 vxdmp: NOTICE: VxVM vxdmp V-5-3-0 dmp_scsi_ioctl:
devno=0x11700000002 ret=0x19
Mar 10 22:44:19 s40sb1 vxdmp: NOTICE: VxVM vxdmp V-5-0-0 [Warn] SCSI error
opcode=0x5e returned rq_status=0x7 cdb_status=0x0 key=0x0 asc=0x0 ascq=0x0 on
path 279/0x2
Mar 10 22:44:19 s40sb1 vxdmp: NOTICE: VxVM vxdmp V-5-3-1476 dmp_notify_events:
Total number of events = 1
Mar 10 22:44:19 s40sb1 vxdmp: NOTICE: VxVM vxdmp V-5-3-0 dmp_pr_send_cmd failed
with transport error: uscsi_rqstatus = 7ret = -1 status = 0 on dev 279/0x2
Mar 10 22:44:19 s40sb1 vxdmp: NOTICE: VxVM vxdmp V-5-0-112 [Warn] disabled path
279/0x0 belonging to the dmpnode 302/0x0 due to path failure
Mar 10 22:44:19 s40sb1 vxdmp: NOTICE: VxVM vxdmp V-5-3-1476 dmp_notify_events:
Total number of events = 2
Mar 10 22:44:19 s40sb1 vxdmp: NOTICE: VxVM vxdmp V-5-0-111 [Warn] disabled
dmpnode 302/0x0
[..]

DESCRIPTION:
Non-SCSI devices do not support SCSI persistent reservation commands. Thus,
SCSI-3 persistent commands 'ioctls' on non-SCSI device fails with unsupported
error codes. Due to which, Dynamic Multipathing (DMP) ends up treating ioctl
failure as path error causing dmpnode to get disabled.

RESOLUTION:
The DMP code is modified such that SCSI-3 persistent reservation
commands are not sent on non-SCSI devices.

* 3470255 (Tracking ID: 2847520)

SYMPTOM:
Users can create linked volume using 'vxsnap addmir ... mirdg=<dg> mirvol=<vol>' CLI. The target volume then can be used to create snapshot using 'vxsnap make source=<src-vol> snap=<tgt-vol> snapdg=<tgt-dg>' CLI. When such linked volume is created in the clustered environment and the resize operation is executed on the volume, it can cause corruption of target volume. So, if such a target volume is used to create snapshot, it would be corrupted as well. If the linked volume had a VxFS filesystem created on it and the user tries to mount the snapshot created using such a corrupted target volume, it might fail with the following error message:

UX:vxfs mount: ERROR: V-3-26883: fsck log replay exits with 12
UX:vxfs mount: ERROR: V-3-26881: Cannot be mounted until it has been cleaned by
fsck. Please run "fsck -V vxfs -y /dev/vx/dsk/snapdg/snapvol" before mounting.

DESCRIPTION:
When a linked volume is resized, maps are updated to keep track of regions inconsistent between the source volume and the target volume for the grown/shrunk region. Such update of map should ideally happen only from one node/machine in the cluster. Due to some problems, the map was getting updated concurrently from two different nodes/machine causing inconsistent maps. When this map was used to synchronize the target volume, it would lead to data on target volume not getting synchronized correctly and thus led to corrupted target volume.

RESOLUTION:
The code is modified to make sure that the map is updated only from one node if the volume is shared.

* 3470260 (Tracking ID: 3415188)

SYMPTOM:
Filesystem/IO hangs during data replication with Symantec Replication Option (VVR) with the following stack trace:
schedule()
volsync_wait() 
volopobjenter()
vol_object_ioctl() 
voliod_ioctl() 
volsioctl_real()
vols_ioctl() 
vols_compat_ioctl()
compat_sys_ioctl() 
sysenter_dispatch()

DESCRIPTION:
One of the structures of Symantec Replication Option that are associated with Storage Replicator Log (SRL) can become invalid because of improper locking mechanism in code that leads to IO/file system hang.

RESOLUTION:
The code is changed to have appropriate locks to protect the code.

* 3470262 (Tracking ID: 3077582)

SYMPTOM:
A Veritas Volume Manager (VxVM) volume may become inaccessible causing the read/write operations to fail with the following error:
# dd if=/dev/vx/dsk/<dg>/<volume> of=/dev/null count=10
dd read error: No such device
0+0 records in
0+0 records out

DESCRIPTION:
If I/Os to the disks timeout due to some hardware failures like weak Storage Area Network (SAN) cable link or Host Bus Adapter (HBA) failure, VxVM assumes that the disk is faulty or slow and it sets the failio flag on the disk. Due to this flag, all the subsequent I/Os fail with the ANo such deviceA error.

RESOLUTION:
The code is modified such that vxdisk now provides a way to clear the failio flag. To check whether the failio flag is set on the disks, use the vxkprint(1M) utility (under /etc/vx/diag.d). To reset the failio flag, execute the Avxdisk set <disk_name> failio=offA command, or deport and import the disk group that holds these disks.

* 3470265 (Tracking ID: 3326964)

SYMPTOM:
VxVM () hangs in CVM environment in presence of Fast Mirror Resync FMR)/Flashsnap operations with the following stack trace:
voldco_cvm_serialize()
voldco_serialize()
voldco_handle_dco_error()
voldco_mapor_sio_done()
voliod_iohandle()
voliod_loop()
child_rip()
voliod_loop()
child_rip()

DESCRIPTION:
During split brain testing in presence of FMR activities, when errors occur on the Data change object (DCO), the DCO error handling code sets up a flag due to which the same error gets set again in its handler. Consequently the VxVM Staged I/O (SIO) loop around the same code and causes the hang.

RESOLUTION:
The code is changed to appropriately handle the scenario.

* 3470270 (Tracking ID: 3403390)

SYMPTOM:
The linked-to volume goes into NEEDSYNC state if the system crashes while I/Os are ongoing on the linked-from volume or the linked-from volume is open by any application.

DESCRIPTION:
In this case, when the system comes up, volume recovery is performed on the linked-from volume which also recovers the linked-to volumes associated to it. But still, the linked-to volumes were shown in NEEDSYNC state even though no recovery was required.

RESOLUTION:
The code is modified to prevent linked-to volume from going into NEEDSYNC
state in the above mentioned scenarios and hence no recovery is required for the linked-to volume.

* 3470272 (Tracking ID: 3385753)

SYMPTOM:
Replication to the Disaster Recovery (DR) site hangs even though Replication 
links (Rlinks) are in the connected state.

DESCRIPTION:
Based on Network conditions under User Datagram Protocol (UDP), Symantec 
Replication Option (Veritas Volume Replicator (VVR) has its own
flow control mechanism to control the flow/amount of data to be sent over the 
network. Under error prone network conditions which cause
timeouts, VVR's flow control values become invalid, resulting in replication 
hang.

RESOLUTION:
The code is modified to ensure valid values for the flow control even under 
error prone network conditions.

* 3470274 (Tracking ID: 3373208)

SYMPTOM:
Veritas Dynamic Multipathing (DMP) wrongly sends the SCSI PR OUT command with Activate Persist Through Power Loss (APTPL) bit with value as A0A to array that supports the APTPL capabilities.

DESCRIPTION:
DMP correctly recognizes the APTPL bit settings and stores them in the database. DMP verifies this information before sending the SCSI PR OUT command so that the APTPL bit can be set appropriately in the command. But, due to issue in the code, DMP was not handling the node's device number properly. Due to which, the APTPL bit was getting incorrectly set in the SCSI PR OUT command.

RESOLUTION:
The code is modified to handle the node's device number properly in the DMP SCSI command code path.

* 3470275 (Tracking ID: 3417044)

SYMPTOM:
The system becomes unresponsive while creating Veritas Volume Replication (VVR) 
TCP connection. The vxiod kernel thread reports the following stack trace:

mt_pause_trigger() 
wait_for_lock() 
spinlock_usav() 
kfree() 
t_kfree() 
kmsg_sys_free() 
nmcom_connect() 
vol_rp_connect() 
vol_rp_connect_start() 
voliod_iohandle() 
voliod_loop()

DESCRIPTION:
When multiple TCP connections are configured, some of these connections are 
still in the active state and the connection request process function attempts 
to free a memory block. If this block is already freed by a previous connection, 
then the kernel thread may become unresponsive on a HPUX platform.

RESOLUTION:
The code is modified to resolve the issue of freeing a memory block which is 
already freed by another connection.

* 3470279 (Tracking ID: 3300418)

SYMPTOM:
VxVM volume operations on shared volumes cause unnecessary read I/Os on the
disks that have both configuration copy and log copy disabled on slaves.

DESCRIPTION:
The unnecessary disk read I/Os are generated on slaves when VxVM is refreshing
the private region information into memory during VxVM transaction. In fact,
there is no need to refresh the private region information if the disk already
has disabled the configuration copy and log copy.

RESOLUTION:
The code has been changed to skip the refreshing if both configuration copy and
log copy are already disabled on master and slaves.

* 3470282 (Tracking ID: 3374200)

SYMPTOM:
A Linux-based system panic or exceptional IO delay is observed on the volume when a snapshot operation is executed. In case of a panic, the following stack trace is reported:
spin_lock_irqsave() 
volpage_getlist_internal()  
volpage_getlist()
voldco_needupdate_instant()  
volfmr_needupdate_instant()

DESCRIPTION:
Volume Manager uses a system wide pool of memory to manage IO and snapshot operations (paging module). The default size is 6MB on Linux, which suffices for 1 TB volume. For snapshot operations, the default size is increased dynamically without considering the IO performed by other volumes. Thus, during a snapshot operation, contention on the paging module occurs leading to delays in IO handling or sometimes panics.

RESOLUTION:
The code is modified such that the default paging module size on Linux is increased to 64M. However, if you still face the issue then you can   manually increase the paging module size using the volpagemod_max_memsz tunable. Or, to avoid manual intervention, To avoid contention during the snapshot operation, the paging module size is increased considering the other online volumes in the system.

* 3470290 (Tracking ID: 2999871)

SYMPTOM:
The vxinstall(1M) command gets into a hung state when it is invoked
through Secure Shell (SSH) remote execution.

DESCRIPTION:
The vxconfigd process which starts from the vxinstall script fails
to close the inherited file descriptors, causing the vxinstall to enter the hung
state.

RESOLUTION:
The code is modified to handle the inherited file descriptors for
the vxconfigd process.

* 3470291 (Tracking ID: 3350077)

SYMPTOM:
VxVM fails to shrink actively used vxvm secondary paging device with the following error message:
"VxVM vxvm ERROR V-5-2-0 Cannot shrink the pagespace"

DESCRIPTION:
While shrinking an actively used vxvm secondary paging device, VxVM creates a temporary smaller paging space, based on the input size to decrease (input_size_to_decrease). After this, VxVM deactivates the currently used secondary paging space and activates the newly created temporary smaller paging space as the new secondary paging device. The size of the temporary paging space created should equal to the value of that total_size minus input_size_to_decrease. But actually, the size is the value of input_size_to_decrease which may be smaller than the current in-use size of the secondary paging space to be shrinked. As a result, the in-use vxvm paging space cannot be deactivated. This causes VxVM fails to shrink the secondary paging space.

RESOLUTION:
The code is modified to create a temporary paging space of an appropriate size, so that shrink operations succeed.

* 3470293 (Tracking ID: 3367997)

SYMPTOM:
System panics during LUN removal operations with the following stack trace:

gen_local_update_cur_pri()
dmp_disable_path()
dmp_change_path_state()
vxdmpioctl()

DESCRIPTION:
A few parts of the code associated with Array Policy Module (APM) are not pinned before loading the module. Therefore, there is
 a possibility that parts of APM module get swapped out of memory while loading which causes memory corruption and results in panic.

RESOLUTION:
The code is modified to pin the code before loading APM module.

* 3470300 (Tracking ID: 3340923)

SYMPTOM:
The following kind of messages are seen in system log corresponding to
the unavailable asymmetric access state paths.

..
..
kernel: [859680.551729] end_request: I/O error, dev
sdc, sector 44515143296
kernel: [859680.552219] VxVM vxdmp V-5-0-112 disabled
path 8/0x20 belonging to the dmpnode 201/0x40 due to path failure
kernel: [859690.554947] VxVM vxdmp V-5-0-1652
dmp_alua_update_alua_info: change in aas detected for node=8/32 old_aas: 0
new_aas: 3
kernel: [859690.554980] VxVM vxdmp V-5-0-148 enabled
path 8/0x20 belonging to the dmpnode 201/0x40
..
..

DESCRIPTION:
The paths with unavailable asymmetric access state do not service I/O. Hence by design, DMP tries to return path failure for such paths. This avoids such paths getting selected for I/Os. But due to an issue, DMP returns path okay and causes path to be enabled back.

RESOLUTION:
The code is modified to fix this issue.

* 3470301 (Tracking ID: 2812161)

SYMPTOM:
In a VVR environment, after the Rlink is detached, the vxconfigd(1M) daemon on 
the secondary host may hang. The following stack trace is observed:
cv_wait
delay_common
delay
vol_rv_service_message_start
voliod_iohandle
voliod_loop
...

DESCRIPTION:
There is a race condition if there is a node crash on the primary site of VVR 
and if any subsequent Rlink is detached. The vxconfigd(1M) daemon on the 
secondary site may hang, because it is unable to clear the I/Os received from 
the primary site.

RESOLUTION:
The code is modified to resolve the race condition.

* 3470303 (Tracking ID: 3314647)

SYMPTOM:
The vxcdsconvert(1M) command fails with following options when disk group (DG) contains multiple volumes:

/etc/vx/bin/vxcdsconvert -o novolstop -g <DGNAME> group move_subdisks_ok=yes 
evac_subdisks_ok=yes

relayout: ERROR! Plex column offset is not strictly increasing for column/plex
0/<VOLUME NAME>

DESCRIPTION:
When the vxcdsconvert(1M) command is invoked with "group" option, it converts non-cds disks to Cross-Platform-Data Sharing(CDS) formatted disks. The command will align and resize subdisks within the DG to make sure alignment of all volumes is 8k and finally set CDS flag on the DG.

The command may need to relocate subdisks when it formats the disks with CDS format. To do this, it uses some global variables which indicate the subdisks from volume which need to be re-analyzed. To align all volumes at 8K boundaries, same global variables are used and since these global variables were already set during disk initialization, stale values were used during volume alignment which causes the error.

RESOLUTION:
The code is modified so that before volumes are considered for 8K alignment, the global variables, which indicate whether some subdisks need to be reanalyzed for alignment or not, are reset.

* 3470322 (Tracking ID: 3399323)

SYMPTOM:
The reconfiguration of Dynamic Multipathing (DMP) database fails with the below error: VxVM vxconfigd DEBUG  V-5-1-0 dmp_do_reconfig: DMP_RECONFIGURE_DB failed: 2

DESCRIPTION:
As part of the DMP database reconfiguration process, controller information from DMP user-land database is not removed even though it is removed from DMP kernel database. This creates inconsistency between the user-land and kernel-land DMP database. Because of this, subsequent DMP reconfiguration fails with above error.

RESOLUTION:
The code changes have been made to properly remove the controller information from the user-land DMP database.

* 3470345 (Tracking ID: 3281004)

SYMPTOM:
For DMP minimum queue I/O policy with large number of CPUs, the following 
issues are observed since the VxVM 5.1 SP1 release: 
1. CPU usage is high. 
2. I/O throughput is down if there are many concurrent I/Os.

DESCRIPTION:
The earlier minimum queue I/O policy is used to consider the host controller 
I/O load to select the least loaded path. For VxVM 5.1 SP1 version, an addition 
was made to consider the I/O load of the underlying paths of the selected host 
based controllers. However, this resulted in the performance issues, as there 
were lock contentions with the I/O processing functions and the DMP statistics 
daemon.

RESOLUTION:
The code is modified such that the host controller paths I/O load is not 
considered to avoid the lock contention.

* 3470347 (Tracking ID: 3444765)

SYMPTOM:
In Cluster Volume Manager (CVM), shared volume recovery may take long time for large configurations.

DESCRIPTION:
In the CVM environment, the volume recovery operation involves following tasks:
1. Unconditional Data Change Object (DCO) volume recovery. 
2. Recovery using the vxvol noderecover(1M) command. 

But the DCO volume recovery is done serially and the noderecover(1M) command is executed separately for each volume which needs recovery. Therefore, the complete recovery operation can take longer time.

RESOLUTION:
The code changes are done to recover DCO volume only if required and the recovery of multiple DCO volumes will be done in parallel. Similarly, single vxvol noderecover(1M) command will be issued for multiple volumes.

* 3470350 (Tracking ID: 3437852)

SYMPTOM:
The system panics when  Symantec Replicator Option goes to PASSTHRU
mode. Panic stack trace might look like:

vol_rp_halt()
vol_rp_state_trans()
vol_rv_replica_reconfigure()
vol_rv_error_handle()
vol_rv_errorhandler_callback()
vol_klog_start()
voliod_iohandle()
voliod_loop()

DESCRIPTION:
When Storage Replicator Log (SRL) gets faulted for any reason, VVR
goes into the PASSTHRU Mode. At this time, a few updates are erroneously freed.
When these updates are accessed during the correct processing, access to these
updates results in panic as the updates are already freed.

RESOLUTION:
The code changes have been made not to free the updates erroneously.

* 3470352 (Tracking ID: 3450758)

SYMPTOM:
The slave node panics when it tries to join the cluster with the following stack:
bad_area_nosemaphore()
page_fault()
vol_plex_iogen()
volobject_iogen()
vol_cvol_volobject_iogen()
vol_cvol_init_iogen()
vol_cache_linkdone()
cvm_msg_cfg_end()
vol_kmsg_request_receive()
vol_kmsg_receiver()
kernel_thread()

DESCRIPTION:
The panic happens when the node generates a Staged I/O (SIO) for the plex object in the process of validating the cache object (parent) and plex object (child) associations. Some of the fields of the plex object which have not been populated are accessed as part of the SIO generation. This access to NULL fields leads to panic.

RESOLUTION:
The code changes have been made to avoid accessing those NULL fields of plex object while the slave node joins the cluster.

* 3470353 (Tracking ID: 3236772)

SYMPTOM:
Replication with heavy I/O loads on primary sites result in the following errors
on the secondary site: 
1. "Transaction aborted waiting for io drain"
and/or
2. "vradmin ERROR Lost connection to host"

DESCRIPTION:
A deadlock between 'transaction' and messages delivered to the secondary site
results in repeated timeouts of transactions on the secondary site. These
repeated transaction timeouts cause transaction failures and/or session timeouts
between primary and secondary sites.

RESOLUTION:
The code is modified to resolve the deadlock condition.

* 3470354 (Tracking ID: 3446415)

SYMPTOM:
When the file system shrink operation is performed on FileStore, a
different pool may get added to the file system
Example:

# fs create mirrored <FS> 8g 2 pool01 protection=disk 

# fs list
FS                        STATUS       SIZE    LAYOUT              MIRRORS   
COLUMNS   USE%  NFS SHARED  CIFS SHARED  SECONDARY TIER  POOL LIST
========================= ======       ====    ======              =======   
=======   ====  ==========  ===========  ==============  =========
<FS>                     online      8.00G    mirrored            2         - 
         
1%     no          no           no           pool01


# fs shrinkto primary <FS> 4g

# fs list
FS                        STATUS       SIZE    LAYOUT              MIRRORS   
COLUMNS   USE%  NFS SHARED  CIFS SHARED  SECONDARY TIER  POOL LIST
========================= ======       ====    ======              =======   
=======   ====  ==========  ===========  ==============  =============
<FS>                 online      4.00G    mirrored            2         - 
         
2%     no          no           no           pool01, pool02

DESCRIPTION:
While performing shrink operation on volume, associated DCO volume gets
recreated. But during this operation, specified site tags on command line are
not taken into consideration. Thus, new DCO volumes may get created on the disk
that has different site tag. Due to this, different pools are added to file
system on FileStore.

RESOLUTION:
The code is modified to properly allocate DCO volume within the
specified pool of the disk during the volume shrink operation.

* 3470382 (Tracking ID: 3368361)

SYMPTOM:
When site consistency is configured within a private disk group and Cluster
Volume Manager (CVM) is up, the reattach operation of a detached site fails.

DESCRIPTION:
When you try to reattach the detached site configured in a private disk-group
with CVM up on that node, the reattach operation fails with
the following error

"Disk (disk_name) do not have connectivity from one or more cluster nodes". 

The reattach operation fails because you are not checking the shared attribute
of the disk group when you apply the disk connectivity
check for a private disk group.

RESOLUTION:
The code is modified to make the disk connectivity check explicit for a shared
disk group by checking the shared attribute of a disk group.

* 3470383 (Tracking ID: 3455460)

SYMPTOM:
The vxfmrshowmap and verify_dco_header utilities fail with the following error 
message:
vxfmrshowmap:
VxVM  ERROR V-5-1-15443 seek to <offset-address> for <device-name> FAILED:Error 
0

verify_dco_header:
Cannot lseek to offset:<offset-address>

DESCRIPTION:
The issue occurs because the large offsets are not handled properly while 
seeking using 'lseek', as a part of the vxfmrshowmap and verify_dco_header 
utilities.

RESOLUTION:
The code is modified to properly handle large offsets as a part of the 
vxfmrhsowmap and verify_dco_header utilities.

* 3470384 (Tracking ID: 3440790)

SYMPTOM:
Sometimes the vxassist(1M) command with parameter mirror and the vxplex(1M) command  with parameter att hang. The hang is observed by looking at the vxtask list output which shows no progress of the tasks.

DESCRIPTION:
Sometimes the vxassist(1M) command with parameter mirror and the  vxplex command(1M) with parameter att result into hang, showing no progress of operation in the vxtask list o/p. This operation requires a kernel memory to copy data from one plex to another and this memory is allocated from a dedicated Veritas Volume Manager (VxVM) memory pool. Due to some problems in calculating free memory in the pool, the task forever waits for memory even though enough memory is available in pool.

RESOLUTION:
The code is modified to properly compute the free memory available in VxVM's memory pool use for these operations.

* 3470385 (Tracking ID: 3373142)

SYMPTOM:
Manual pages for vxedit and vxassist do not contain details about updated
behavior of these commands.

DESCRIPTION:
1. vxedit manual page
On this page it explains that if the reserve flag is set 
for a disk, then vxassist will not allocate a data subdisk on that disk unless
the disk is specified on the vxassist command line. But Data Change Object (DCO)
volume creation by vxassist or vxsnap command will not honor the reserved flag.

2. vxassist manual page
DCO allocation policy has been updated starting from 6.0. The allocation policy
may not succeed if there is insufficient disk space. The vxassist command then
uses available space on the remaining disks of the disk group. This may prevent
certain disk group from splitting or moving if the DCO plexes cannot accompany
their parent data volume.

RESOLUTION:
The manual pages for both commands have been updated to reflect the new
behavioral changes.

* 3490147 (Tracking ID: 3485907)

SYMPTOM:
Panic occurs in the I/O code path. The following stack trace is observed:
...
volkcontext_process()
volkiostart()
vxiostrategy()
...

or
...
voliod_iohandle()
voliod_loop()
...

DESCRIPTION:
When the snapshot reattach operation is in progress on a volume, the metadata 
of the snapshot get's updated. If any parallel I/O during this operation gets 
incorrect state of
Metadata, this leads to IO's of zero size being created. This leads to system 
panic.

RESOLUTION:
The code is modified to avoid the generation of I/Os of zero length, on volumes 
which are under the snapshot operations.

* 3506679 (Tracking ID: 3435225)

SYMPTOM:
In a given CVR setup, rebooting the master node causes one of the slaves to
panic with following stack:

pse_sleep_thread
vol_rwsleep_rdlock
vol_kmsg_send_common
vol_kmsg_send_prealloc
cvm_obj_sendmsg_prealloc
vol_rv_async_done
volkcontext_process
voldiskiodone

DESCRIPTION:
The issue is triggered by one of the code paths sleeping in interrupt context.

RESOLUTION:
The code is modified so that sleep is not invoked in interrupt context.

* 3506707 (Tracking ID: 3400504)

SYMPTOM:
While disabling the host side HBA port, extended attributes of some devices are
not present anymore. This happens even when there is a redundant controller
present on the host which is in enabled state.

An example output is shown below where the 'srdf' attribute of an EMC device
(which has multiple paths through multiple controllers) gets affected.

Before the port is disabled-
# vxdisk -e list emc1_4028
emc1_4028    auto:cdsdisk   emc1_4028    dg21        online      
c6t5000097208191154d112s2 srdf-r1

After the port is disabled-
# vxdisk -e list emc1_4028
emc1_4028    auto:cdsdisk   emc1_4028    dg21        online      
c6t5000097208191154d112s2 -

DESCRIPTION:
The code which prints the extended attributes used to print the attributes of
the first path in the list of all paths. If the first path belongs to the
controller which is disabled, its attributes will be empty.

RESOLUTION:
The code is modified to look for the path in enabled state among all the paths
and then print the attributes of such path.

* 3506709 (Tracking ID: 3259732)

SYMPTOM:
In a Clustered Volume Replicator (CVR) environment, if the SRL size grows and if
it is followed by a slave node leaving and then re-joining the cluster then
rlink is detached.

DESCRIPTION:
After the slave re-joins the cluster, it does not correctly receive and process
the SRL resize information received from the master. This means that application
writes initiated on this slave may corrupt the SRL causing rlink to detach.

RESOLUTION:
The code is modified so that when a slave joins the cluster, make sure that the
SRL resize related information is correctly received and processed by the slave.

* 3531570 (Tracking ID: 3511067)

SYMPTOM:
Absence of storage key permission in the error handling code path results in a node panic with the following stack trace:

kmsg_gab_send
vol_kmsg_sendmsg
vol_kmsg_forward_ring_broadcast
cvm_nidmaster_send_wait
cvmnid_node_is_noncoord
set_nodeid_protocol
vol_set_membership
volcvm_vxreconfd_set_members
volcvm_vxreconfd_thread
vxvm_start_thread_enter

DESCRIPTION:
The sender and the receiver thread have the required storage key permission set. But, for the reconfiguration thread, VOL_SK_VMCOMM_RW_ACCESS permission is not set. Due to an increase in the number of keys for storage in AIX 7.1 and P7, the node panics.

RESOLUTION:
The code is modified to add storage key permission.

* 3531906 (Tracking ID: 3526500)

SYMPTOM:
Disk IO failures occur with DMP IO timeout error messages when DMP (Dynamic Multi-pathing) IO statistics daemon is not running. Following are the timeout error messages:

VxVM vxdmp V-5-3-0 I/O failed on path 65/0x40 after 1 retries for disk 201/0x70
VxVM vxdmp V-5-3-0 Reached DMP Threshold IO TimeOut (100 secs) I/O with start 
3e861909fa0 and end 3e86190a388 time
VxVM vxdmp V-5-0-0 [Error] i/o error occurred (errno=0x206) on dmpnode 201/0x70

DESCRIPTION:
When IO is submitted to DMP, it sets the start time on the IO buffer. The value of the start time depends on whether the DMP IO statistics daemon is running or not. When the IO is returned as error from SCSI to DMP, instead of retrying the IO on alternate paths, DMP failed that IO with 300 seconds timeout error, but the IO has elapsed only few milliseconds in its execution. The miscalculation of DMP timeout happens only when DMP IO statistics daemon is not running.

RESOLUTION:
The code is modified to calculate appropriate DMP IO timeout value when DMP IO statistics demon is not running.

* 3536289 (Tracking ID: 3492062)

SYMPTOM:
Dynamic Multi-Pathing (DMP) fails to get page 0x83 LUN identifier for EMC symmetrix LUNS and continuously logs the following error message: 
AVxVM vxdmp V-5-3-1984 dmp_restore_callback: devid could not be extracted from pg 0x83 on pathA

DESCRIPTION:
If DMP fails to get page 0x83 LUN identifier for EMC symmetrix LUNS during discovery, then DMP should set a device identifier unsupported flag on the corresponding DMP node. Currently, there is no code to set this flag and hence, the restore daemon identifies such devices as device identifier mismatch case and logs error messages.

RESOLUTION:
The code is modified to mark device identifier unsupported flag if it could not be extracted during discovery process so that the restore daemon does not pick it up for device identifier mismatch case. Also, the message is converted from NOTE message to LOG message type.

* 3540122 (Tracking ID: 3482026)

SYMPTOM:
The vxattachd(1M) daemon reattaches plexes of manually detached site.

DESCRIPTION:
The vxattachd daemon reattaches plexes for a manually detached site that is the site with state as OFFLINE. As there was no check to differentiate between a manually detach site and the site that was detached due to IO failure. Hence, the vxattachd(1M) daemon brings the plexes online for manually detached site also.

RESOLUTION:
The code is modified to differentiate between manually detached site and the site detached due to IO failure.

* 3543944 (Tracking ID: 3520991)

SYMPTOM:
The vxconfigd(1M) daemon dumps core due to memory corruption and displays the following stack trace:

1. 

malloc_y()
malloc_common 
misc.xalloc()
dll_iter_next()
ddl_claim_single_disk()
ddl_thread_claim_disk()
ddl_task_start()
volddl_thread_start()

OR

2. 

free_y()
free_common()
ddl_name_value_api.nv_free
ddl_vendor_claim_device()
ddl_claim_single_disk()
ddl_thread_claim_disk()
ddl_task_start() at
volddl_thread_start()

DESCRIPTION:
Device Discovery Layer (DDL) maintains a bitmap data structure for the Array Support Libraries (ASLs) present on hosts. If the number of Array Support Libraries (ASLs) are greater than or equal to 64, then, while setting the 64th bit in the bitmap data structure associated with the ASLs, DDL performs an out of bound write operation. This memory corruption causes either vxconfigd daemon to dump core or other unexpected issues.

RESOLUTION:
The Device Discovery Layer (DDL) code is modified to fix this issue.

Patch ID: 6.1.0.100

* 3444900 (Tracking ID: 3399131)

SYMPTOM:
The following command fails with an error for a path managed by Third Party
Driver (TPD) which co-exists with DMP.
# vxdmpadm -f disable path=<path name> 
VxVM vxdmpadm ERROR V-5-1-11771 Operation not supported

DESCRIPTION:
The Third Party Drivers manage the devices with or without the co-existence of
Dynamic Multi Pathing driver. Disabling the paths managed by a third party
driver which does not co-exist with DMP is not supported. But due to bug in the
code, disabling the paths managed by a third party driver which co-exists with
DMP also fails. The same flags are set for all third party driver devices.

RESOLUTION:
The code has been modified to block this command only for the third party
drivers which cannot co-exist with DMP.

* 3445234 (Tracking ID: 3358904)

SYMPTOM:
System panics with following stack:

dmp_alua_get_owner_state()
dmp_alua_get_path_state()
dmp_get_path_state()
dmp_get_enabled_ctlrs()
dmp_info_ioctl()
gendmpioctl()
dmpioctl()
vol_dmp_ktok_ioctl()
dmp_get_enabled_cntrls()
vx_dmp_config_ioctl()
quiescesio_start()
voliod_iohandle()
voliod_loop()
kernel_thread()

DESCRIPTION:
System running with Asymmetric Logical Unit Access (ALUA) LUNs sometimes panics
during path fault scenarios. This happens due to possible NULL pointer
access in some of cases due to bug in the code .

RESOLUTION:
Code changes have been made to fix the bug.

* 3446126 (Tracking ID: 3338208)

SYMPTOM:
writes from fenced out LDOM guest node on Active-Passive (AP/F) shared storage
device fail. I/O failure messages seen in system log..

..
Mon Oct 14 06:03:39.411: I/O retry(6) on Path c0d8s2 belonging to Dmpnode
emc_clariion0_48
Mon Oct 14 06:03:39.951: SCSI error occurred on Path c0d8s2: opcode=0x2a
reported device not ready (status=0x2, key=0x2, asc=0x4, ascq=0x3) LUN not
ready, manual intervention required
Mon Oct 14 06:03:39.951: I/O analysis done as DMP_PATH_FAILURE on Path c0d8s2
belonging to Dmpnode emc_clariion0_48
Mon Oct 14 06:03:40.311: Marked as failing Path c0d1s2 belonging to Dmpnode
emc_clariion0_48
Mon Oct 14 06:03:40.671: Disabled Path c0d8s2 belonging to Dmpnode
emc_clariion0_48 due to path failure
..
..

DESCRIPTION:
write SCSI commands from fenced out host should fail with reservation
conflict from shared device. This error code needs to be propagated to upper
layers for appropriate action.

In DMP ioctl interface, DMP first sends command through available active paths.
If command fails then command was unnecessarily tried on passive paths. 

This causes command to be failed with not ready error code and this error code
getting propagated to upper layer instead of reservation conflict.

RESOLUTION:
Added code changes to not retry IO SCSI commands on passive paths in case of
Active-Passive (AP/F) shared storage device.

* 3447306 (Tracking ID: 3424798)

SYMPTOM:
Veritas Volume Manager (VxVM) mirror attach operations (e.g., plex attach,
vxassist mirror, and third-mirror break-off snapshot resynchronization) may take
longer time under heavy application I/O load. The vxtask list command shows
tasks are in the 'auto-throttled (waiting)' state for a long time.

DESCRIPTION:
With the AdminIO de-prioritization feature, VxVM administrative I/O's (e.g. plex
attach, vxassist mirror, and third-mirror break-off snapshot resynchronization)
are de-prioritized under heavy application I/O load, but this can lead to very
slow progress of these operations.

RESOLUTION:
The code is modified to disable the AdminIO de-prioritization feature.

* 3447894 (Tracking ID: 3353211)

SYMPTOM:
A. After EMC Symmetrix BCV (Business Continuance Volume) device switches to
read-write mode, continuous vxdmp (Veritas Dynamic Multi Pathing) error messages
flood syslog as shown below:

NOTE VxVM vxdmp V-5-3-1061 dmp_restore_node: The path 18/0x2 has not yet aged - 
299
NOTE VxVM vxdmp 0 dmp_tur_temp_pgr: open failed: error = 6 dev=0x24/0xD0
NOTE VxVM vxdmp V-5-3-1062 dmp_restore_node: Unstable path 18/0x230 will not be 
available for I/O until 300 seconds
NOTE VxVM vxdmp V-5-3-1061 dmp_restore_node: The path 18/0x2 has not yet aged - 
299
NOTE VxVM vxdmp V-5-0-0 [Error] i/o error occurred (errno=0x6) on dmpnode 
36/0xD0
..
..

B. DMP metanode/path under DMP metanode gets disabled unexpectedly.

DESCRIPTION:
A. DMP caches the last discovery NDELAY open for the BCV dmpnode paths. BCV
device switching to read-write mode is an array side operation. Typically in
such cases, the 
system administrators are required to run the following command:

1. vxdisk rm <accessname>

OR 

In case of parallel backup jobs,

1. vxdisk offline <accessname>
2. vxdisk online <accessname>

This causes DMP to close cached open, and during the next discovery, the device
is opened in read-write mode. If the above steps are skipped then it causes the
DMP device to go in state where one of the paths is in read-write mode and the
others remain in NDELAY mode. 

If the above layers request for NORMAL open, then the DMP has the code to close
NDELAY cached open and reopen in NORMAL mode. When the dmpnode is online, this
happens only for one of the paths of dmpnode. 

B. DMP performs error analysis for paths on which I/O has failed. In some cases,
the SCSI probes are sent, failed with the return value/sense codes that are not
handled by DMP. This causes the paths to get disabled.

RESOLUTION:
A. The code is modified for the DMP EMC ASL (Array Support Library) to handle
case A for EMC Symmetrix arrays.
B. The DMP code is modified to handle the SCSI conditions correctly for case B.

* 3449714 (Tracking ID: 3417185)

SYMPTOM:
Rebooting host, after the exclusion of a dmpnode while I/O is in progress on it,
leads to vxconfigd core dump.

DESCRIPTION:
The function which deletes the path after exclusion, does not update the 
corresponding data structures properly. Consequently, rebooting the host, after 
the exclusion of dmpnode while I/O is in progress on it, leads to vxconfigd core 
dump with following stack

ddl_find_devno_in_table ()
ddl_get_disk_policy ()
devintf_add_autoconfig_main ()
devintf_add_autoconfig ()
mode_set ()
req_vold_enable ()
request_loop ()
main ()

RESOLUTION:
Code changes have been made to update the data structure properly.

* 3452709 (Tracking ID: 3317430)

SYMPTOM:
"vxdiskunsetup" utility throws  error during execution. 
Following error message is observed.
"Device unexport failed: Operation is not supported".

DESCRIPTION:
In vxdisksetup vxunexport is called, without checking if the disk is 
exported or the CVM protocol version. When the bits are upgraded 
from 5.1SP1RP4, the CVM protocol version is not updated. Hence the error.

RESOLUTION:
Code changes done so that the vxunexport is called after doing proper checks.

* 3452727 (Tracking ID: 3279932)

SYMPTOM:
The vxdisksetup and vxdiskunsetup utilities were failing on disk which
is part of deported disk group (DG), even if '-f' option is specified.
The vxdisksetup command fails with following error:

VxVM vxedpart ERROR V-5-1-10089 partition modification failed :
Device or resource busy 

The vxdiskunsetup command fails following error:

VxVM vxdisk ERROR ERROR V-5-1-0 Device <Disk name> appears to be 
owned by disk group <Disk group>. Use -f option to force destroy.
VxVM vxdiskunsetup ERROR V-5-2-5052 <Disk name>: Disk destroy failed.

DESCRIPTION:
The vxdisksetup and vxdiskunsetup utilities internally call the
'vxdisk' utility. Due to a defect in vxdisksetup and vxdiskunsetup, the vxdisk
operation used to fail on disk which is part of deported DG, even if '-f'
operation is requested by user.

RESOLUTION:
Code changes are done to the vxdisksetup and vxdiskunsetup
utilities so that when "-f" option is specified the operation succeeds.

* 3452811 (Tracking ID: 3445120)

SYMPTOM:
Default value of tunable 'vol_min_lowmem_sz' is not consistent on all platforms.

DESCRIPTION:
Default value of tunable 'vol_min_lowmem_sz' is not consistent on all platforms.

RESOLUTION:
Set the default value of tunable 'vol_min_lowmem_sz' to 32MB on all platforms.

* 3455455 (Tracking ID: 3409612)

SYMPTOM:
Fails to run "vxtune reclaim_on_delete_start_time <value>" if the specified
value is 
outside the range of 22:00-03:59 (E.g. setting it to 04:00 or 19:30 fails).

DESCRIPTION:
Tunable reclaim_on_delete_start_time can be set to any time value within 00:00
to 23:59. But because of the wrong regular expression to parse time, it cannot
be set to all values in 00:00 - 23:59.

RESOLUTION:
The regular expression has been updated to parse time format correctly.
Now all values in 00:00-23:59 can be set.

* 3456729 (Tracking ID: 3428025)

SYMPTOM:
When heavy parallel I/O load is issued, system running Symantec Replication 
Option (VVR) and configured as VVR primary, panics with the below stack:

schedule 
vol_alloc 
vol_zalloc 
volsio_alloc_kc_types 
vol_subdisk_iogen_base 
volobject_iogen 
vol_rv_iogen 
volobject_iogen 
vol_rv_batch_write_start 
volkcontext_process 
vol_rv_start_next_batch 
vol_rv_batch_write_done 
[...]
vol_rv_batch_write_done 
volkcontext_process 
vol_rv_start_next_batch 
vol_rv_batch_write_done 
volkcontext_process 
vol_rv_start_next_batch 
vol_rv_batch_kio 
volkiostart 
vol_linux_kio_start 
vol_fsvm_strategy

DESCRIPTION:
Heavy parallel I/O load leads to I/O throttling in Symantec Replication Option (VVR). Improper throttle handling leads to kernel stack 
overflow.

RESOLUTION:
Handled I/O throttle correctly which avoids stack overflow and subsequent panic.

* 3458036 (Tracking ID: 3418830)

SYMPTOM:
Node boot-up is getting hung while starting vxconfigd if 
'/etc/VRTSvcs/conf/sysname' file or 
'/etc/vx/vxvm-hostprefix' file is not present. User will see following messages 
on console.

# Starting up VxVM
...
# VxVM general startup...

After these messages, it will hung.

DESCRIPTION:
While generating unique prefix, we were calling scanf instead of 
sscanf for fetching prefix which 
resulted in this hang. So while starting vxconfigd, it was waiting for some user 
input because of scanf which 
resulted in hang while booting up the node.

RESOLUTION:
Code changes are done to address this issue.

* 3458799 (Tracking ID: 3197987)

SYMPTOM:
vxconfigd dumps core, when 'vxddladm assign names file=<filename> is executed and the file has one or more invalid values 
for enclosure vendor ID or product ID.

DESCRIPTION:
When the input file provided to 'vxddladm assign names file=<filename>' has invalid vendor ID or product ID, the vxconfigd 
daemon is unable to find the corresponding enclosure being referred to and makes an invalid memory reference. 

Following stack trace can be seen-

strncasecmp () from /lib/libc.so.6
ddl_load_namefile ()
req_ddl_set_names ()
request_loop ()
main ()

RESOLUTION:
As a fix the vxconfigd daemon verifies the validity of input vendor ID and
product ID before making a memory reference to the corresponding enclosure in
its internal data structures.

* 3470346 (Tracking ID: 3377383)

SYMPTOM:
vxconfigd crashes when a disk under DMP reports device failure. After this, the 
following error will be seen when a VxVM (Veritas Volume 
Manager)command is excuted:-
"VxVM vxdisk ERROR V-5-1-684 IPC failure: Configuration daemon is not 
accessible"

DESCRIPTION:
If a disk fails and reports certain failure to DMP (Veritas Dynamic 
Multipathing), then vxconfigd crashes because that error is not handled 
properly.

RESOLUTION:
The code is modified to properly handle the device failures reported by a failed 
disk under DMP.



INSTALLING THE PATCH
--------------------
Run the Installer script to automatically install the patch:
-----------------------------------------------------------
To install the patch perform the following steps on at least one node in the cluster:
1. Copy the hot-fix vm-aix-Patch-6.1.1.400.tar.gz to /tmp
2. Untar vm-aix-Patch-6.1.1.400.tar.gz to /tmp/hf
    # mkdir /tmp/hf
    # cd /tmp/hf
    # gunzip /tmp/vm-aix-Patch-6.1.1.400.tar.gz
    # tar xf /tmp/vm-aix-Patch-6.1.1.400.tar
3. Install the hotfix
    # pwd /tmp/hf
    # ./installVRTSvxvm611P400 [<host1> <host2>...]

Install the patch manually:
--------------------------
If the currently installed VRTSvxvm is below 6.1.1.0 level, 
upgrade VRTSvxvm to 6.1.1.0 level before installing this patch.
AIX maintenance levels and APARs can be downloaded from the IBM web site:
 http://techsupport.services.ibm.com
1. Since the patch process will configure the new kernel extensions,
        a) Stop I/Os to all the VxVM volumes.
        b) Ensure that no VxVM volumes are in use or open or mounted before starting the installation procedure.
        c) Stop applications using any VxVM volumes.
2. Check whether root support or DMP native support is enabled. If it is enabled, it will be retained after patch upgrade.
# vxdmpadm gettune dmp_native_support
If the current value is 'on', DMP native support is enabled on this machine.
# vxdmpadm native list vgname=rootvg
If the output is some list of hdisks, root support is enabled on this machine
3. Proceed with patch installation as mentioned below
    a. Before applying this VxVM 6.1.1.400 patch, stop the VEA Server's vxsvc process:
        # /opt/VRTSob/bin/vxsvcctrl stop
    b. If your system has Veritas Operation Manager(VOM) configured then check whether vxdclid daemon is running, if it is running then stop vxdclid daemon.
       Command to check the status of vxdclid daemon
       #/opt/VRTSsfmh/etc/vxdcli.sh status
       Command to stop the vxdclid daemon
       #/opt/VRTSsfmh/etc/vxdcli.sh stop
    c. To apply this patch, use following command:
       # installp -ag -d ./VRTSvxvm.bff VRTSvxvm
    d. To apply and commit this patch, use following command:
       # installp -acg -d ./VRTSvxvm.bff VRTSvxvm
NOTE: Please refer installp(1M) man page for clear understanding on APPLY & COMMIT state of the package/patch.
    e. Reboot the system to complete the patch  upgrade.
         #reboot    
    f. If you have stopped vxdclid daemon before upgrade then re-start vxdclid daemon using following command
       #/opt/VRTSsfmh/etc/vxdcli.sh start


REMOVING THE PATCH
------------------
Run the Uninstaller script to automatically remove the patch:
------------------------------------------------------------
To uninstall the patch perform the following step on at least one node in the cluster:
    # /opt/VRTS/install/uninstallVRTSvxvm611P400 [<host1> <host2>...]

Remove the patch manually:
-------------------------
1. Check whether root support or DMP native support is enabled or not:
      # vxdmpadm gettune dmp_native_support
If the current value is "on", DMP native support is enabled on this machine.
      # vxdmpadm native list vgname=rootvg
If the output is some list of hdisks, root support is enabled on this machine
If disabled: goto step 3.
If enabled: goto step 2.
2. If root support or DMP native support is enabled:
        a. It is essential to disable DMP native support.
        Run the following command to disable DMP native support as well as root support
              # vxdmpadm settune dmp_native_support=off
        b. If only root support is enabled, run the following command to disable root support
              # vxdmpadm native disable vgname=rootvg
        c. Reboot the system
              # reboot
3.
   a. Before backing out patch, stop the VEA server's vxsvc process:
           # /opt/VRTSob/bin/vxsvcctrl stop
   b. If your system has Veritas Operation Manager(VOM) configured then check whether vxdclid daemon is running, if it is running then stop vxdclid daemon.
      Command to check the status of vxdclid daemon
      #/opt/VRTSsfmh/etc/vxdcli.sh status
      Command to stop the vxdclid daemon
      #/opt/VRTSsfmh/etc/vxdcli.sh stop
   c. To reject the patch if it is in "APPLIED" state, use the following command and re-enable DMP support
      # installp -r VRTSvxvm 6.1.1.400
   d. #  reboot
   e. If you have stopped vxdclid daemon before upgrade then re-start vxdclid daemon using following command
      #/opt/VRTSsfmh/etc/vxdcli.sh start


SPECIAL INSTRUCTIONS
--------------------
NONE


OTHERS
------
NONE