Veritas Volume Manager


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Veritas Volume Manager

This section describes the steps you need to take before removing VERITAS Volume Manager to preserve the contents of the volumes.

Caution Failure to follow the preparations in this section might result in unexpected behavior.

Moving volumes from an encapsulated root disk

To uninstall VxVM if root, swap, usr, or var is a volume under Volume Manager control

Ensure that the rootvol, swapvol, usr, and var volumes have only one associated plex each.
The plex must be contiguous, non-striped, non-spanned, and non-sparse. To obtain this information, enter the following:

# vxprint -ht rootvol swapvol usr var

If any of these volumes have more than one associated plex, remove the unnecessary plexes using the following command:

# vxplex -o rm dis plex_name

Note It is important that you have created the plex designated for rootvol using vxrootmir, which guarantees that the underlying subdisks start on cylinder boundaries and that partitions are created for them.

Run the vxunroot command:

# /etc/vx/bin/vxunroot

The vxunroot command changes the volume entries in /etc/vfstab to the underlying disk partitions for rootvol, swapvol, usr, and var. It also modifies /etc/system and prompts for a reboot so that disk partitions are mounted instead of volumes for root, swap, usr, and var.

Once you have changed the root, swap, usr, and var volumes, move all remaining volumes to disk partitions. You can do this using one of these procedures:
- Back up the entire system to tape and then recover from tape.
- Back up each file system individually and then recover them all after creating new file systems on disk partitions.
- Move volumes incrementally to disk partitions.
  Continue to the next section if you choose this last option. Otherwise, proceed to Shutting down VERITAS Volume Manager.

Moving volumes to disk partitions

To move volumes incrementally to disk partitions

Evacuate disks using vxdiskadm, the VEA GUI, or the vxevac utility.
Evacuation moves subdisks from the specified disks to target disks. The evacuated disks provide the initial free disk space for volumes to be moved to disk partitions.
Remove the evacuated disks from VERITAS Volume Manager control by entering:
# vxdg rmdisk diskname

# vxdisk rm devname
Decide which volume to move first, and if the volume is mounted, unmount it.
If the volume is being used as a raw partition for database applications, make sure that the application is not updating the volume and that you have applied the sync command to the data on the volume.
Create a partition on free disk space of the same size as the volume using the format command.
If there is not enough free space for the partition, add a new disk to the system for the first volume removed. Subsequent volumes can use the free space generated by the removal of this first volume.
Copy the data on the volume onto the newly created disk partition using a command such as dd.
# dd if=/dev/vx/dsk/diskgroup/lhome of=/dev/dsk/c2t2d2s7

where c2t2d2 is the disk outside of Volume Manager and s7 is the newly created partition.
Replace the entry for that volume (if present) in /etc/vfstab with an entry for the newly created partition.
Mount the disk partition if the corresponding volume was previously mounted.
Stop and remove the volume from VERITAS Volume Manager using the commands.
# vxvol -g diskgroup stop volume_name

# vxedit -rf rm volume_name
Remove any free disks (those having no subdisks defined on them) by removing the volumes from VERITAS Volume Manager control.
To check if there are still some subdisks remaining on a particular disk, use the vxprint command.

# vxprint -F '%sdnum' diskname

If the output is not 0, there are still some subdisks on this disk that you need to remove. If the output is 0, remove the disk from VERITAS Volume Manager control.

# vxdg rmdisk diskname

# vxdisk rm devname

Use the free space created for adding the data from the next volume you want to remove.
After you successfully convert all volumes into disk partitions, reboot the system.
After the reboot, make sure none of the volumes are open by using the vxprint command.

# vxprint -Aht -e v_open

If any volumes remain open, repeat the steps listed above.

Example

This example shows how to move the data on a volume to a disk partition. In the example, there are three disks: disk1 and disk2 are subdisks on volume vol01 and disk3 is a free disk. The data on vol01 is copied to disk3 using vxevac.

These are the contents of the disk group voldg before the data on vol01 is copied to disk3.

# vxprint -g voldg -ht

DG NAME NCONFIG NLOG MINORS GROUP-ID

DM NAME DEVICE TYPE PRIVLEN PUBLEN STATE

RV NAME RLINK_CNT KSTATE STATE PRIMARY DATAVOLS SRL

RL NAME RVG KSTATE STATE REM_HOST REM_DG REM_RLNK

V NAME RVG KSTATE STATE LENGTH READPOL PREFPLEX UTYPE

PL NAME VOLUME KSTATE STATE LENGTH LAYOUT NCOL/WID MODE

SD NAME PLEX DISK DISKOFFS LENGTH [COL/]OFF DEVICE MODE

SV NAME PLEX VOLNAME NVOLLAYR LENGTH [COL/]OFF AM/NM MODE

DC NAME PARENTVOL LOGVOL

SP NAME SNAPVOL DCO

dg voldg default default 115000

1017856044.1141.hostname.veritas.com

dm disk1 c1t12d0s2 sliced 2591 17900352 -

dm disk2 c1t14d0s2 sliced 2591 17899056 -

dm disk3 c1t3d0s2 sliced 2591 17899056 -

v vol1 - ENABLED ACTIVE 4196448 ROUND - fsgen

pl pl1 vol1 ENABLED ACTIVE 4196448 CONCAT - RW

sd sd1 pl1 disk1 0 2098224 0 c1t12d0 ENA

sd sd2 pl1 disk2 0 2098224 2098224 c1t14d0 ENA

Evacuate disk1 to disk3.

# /etc/vx/bin/vxevac -g voldg disk1 disk3

# vxprint -g voldg -ht

DG NAME NCONFIG NLOG MINORS GROUP-ID

DM NAME DEVICE TYPE PRIVLEN PUBLEN STATE

RV NAME RLINK_CNT KSTATE STATE PRIMARY DATAVOLS SRL

RL NAME RVG KSTATE STATE REM_HOST REM_DG REM_RLNK

V NAME RVG KSTATE STATE LENGTH READPOL PREFPLEX UTYPE

PL NAME VOLUME KSTATE STATE LENGTH LAYOUT NCOL/WID MODE

SD NAME PLEX DISK DISKOFFS LENGTH [COL/]OFF DEVICE MODE

SV NAME PLEX VOLNAME NVOLLAYR LENGTH [COL/]OFF AM/NM MODE

DC NAME PARENTVOL LOGVOL

SP NAME SNAPVOL DCO

dg voldg default default 115000

1017856044.1141.hostname.veritas.com

dm disk1 c1t12d0s2 sliced 2591 17900352 -

dm disk2 c1t14d0s2 sliced 2591 17899056 -

dm disk3 c1t3d0s2 sliced 2591 17899056 -

v vol1 - ENABLED ACTIVE 4196448 ROUND - fsgen

pl pl1 vol1 ENABLED ACTIVE 4196448 CONCAT - RW

sd disk3-01 pl1 disk3 0 2098224 0 c1t3d0 ENA

sd sd2 pl1 disk2 0 2098224 2098224 c1t14d0 ENA

Evacuate disk2 to disk3.

# /etc/vx/bin/vxevac -g voldg disk2 disk3

# vxprint -g voldg -ht

DG NAME NCONFIG NLOG MINORS GROUP-ID

DM NAME DEVICE TYPE PRIVLEN PUBLEN STATE

RV NAME RLINK_CNT KSTATE STATE PRIMARY DATAVOLS SRL

RL NAME RVG KSTATE STATE REM_HOST REM_DG REM_RLNK

V NAME RVG KSTATE STATE LENGTH READPOL PREFPLEX UTYPE

PL NAME VOLUME KSTATE STATE LENGTH LAYOUT NCOL/WID MODE

SD NAME PLEX DISK DISKOFFS LENGTH [COL/]OFF DEVICE MODE

SV NAME PLEX VOLNAME NVOLLAYR LENGTH [COL/]OFF AM/NM MODE

DC NAME PARENTVOL LOGVOL

SP NAME SNAPVOL DCO

dg voldg default default 115000

1017856044.1141.hostname.veritas.com

dm disk1 c1t12d0s2 sliced 2591 17900352 -

dm disk2 c1t14d0s2 sliced 2591 17899056 -

dm disk3 c1t3d0s2 sliced 2591 17899056 -

v vol1 - ENABLED ACTIVE 4196448 ROUND - fsgen

pl pl1 vol1 ENABLED ACTIVE 4196448 CONCAT - RW

sd disk3-01 pl1 disk3 0 2098224 0 c1t3d0 ENA

sd disk3-02 pl1 disk3 2098224 2098224 2098224 c1t3d0 ENA

Remove the evacuated disks from VERITAS Volume Manager control.

# vxdisk -g voldg list

DEVICE TYPE DISK GROUP STATUS

c1t3d0s2 sliced disk3 voldg online

c1t12d0s2 sliced disk1 voldg online

c1t14d0s2 sliced disk2 voldg online

# vxdg rmdisk disk1

# vxdg rmdisk disk2

# vxdisk rm c1t12d0

# vxdisk rm c1t14d0

Verify that the evacuated disks have been removed from VERITAS Volume Manager control.

# vxdisk -g voldg list

DEVICE TYPE DISK GROUP STATUS

c1t3d0s2 sliced disk3 voldg online

Check to see whether the volume you want to move first is mounted.

# mount | grep vol1

/vol1 on /dev/vx/dsk/voldg/vol1

read/write/setuid/log/nolargefiles/dev=12dc138 on Wed Apr  3
10:13:11 2002

Create a partition on free disk space of the same size as the volume. In this example, a 2G partition is created on disk1 (c1t12d0s1).

# format

Searching for disks...done

AVAILABLE DISK SELECTIONS:

0. c0t0d0 <SUN9.0G cyl 4924 alt 2 hd 27 sec 133>

/sbus@1f,0/SUNW,fas@e,8800000/sd@0,0

1. c1t3d0 <QUANTUM-ATLASIV9SCA-0808 cyl 13814 alt 2 hd 4 sec 324>

/sbus@1f,0/SUNW,fas@2,8800000/sd@3,0

2. c1t9d0 <QUANTUM-ATLASIV9SCA-0808 cyl 13814 alt 2 hd 4 sec 324>

/sbus@1f,0/SUNW,fas@2,8800000/sd@9,0

3. c1t10d0 <QUANTUM-ATLASIV9SCA-0808 cyl 13814 alt 2 hd 4 sec 324>

/sbus@1f,0/SUNW,fas@2,8800000/sd@a,0

4. c1t11d0 <QUANTUM-ATLASIV9SCA-0808 cyl 13814 alt 2 hd 4 sec 324>

/sbus@1f,0/SUNW,fas@2,8800000/sd@b,0

5. c1t12d0 <QUANTUM-ATLASIV9SCA-0808 cyl 13814 alt 2 hd 4 sec 324>

/sbus@1f,0/SUNW,fas@2,8800000/sd@c,0

6. c1t14d0 <QUANTUM-ATLASIV9SCA-0808 cyl 13814 alt 2 hd 4 sec 324>

/sbus@1f,0/SUNW,fas@2,8800000/sd@e,0

7. c1t15d0 <QUANTUM-ATLASIV9SCA-0808 cyl 13814 alt 2 hd 4 sec 324>

/sbus@1f,0/SUNW,fas@2,8800000/sd@f,0

Specify disk (enter its number): 5

selecting c1t12d0

[disk formatted]

FORMAT MENU:

disk - select a disk

type - select (define) a disk type

partition - select (define) a partition table

current - describe the current disk

format - format and analyze the disk

repair - repair a defective sector

label - write label to the disk

analyze - surface analysis

defect - defect list management

backup - search for backup labels

verify - read and display labels

save - save new disk/partition definitions

inquiry - show vendor, product and revision

volname - set 8-character volume name

!<cmd> - execute <cmd>, then return

quit

format> p

PARTITION MENU:

0 - change `0' partition

1 - change `1' partition

2 - change `2' partition

3 - change `3' partition

4 - change `4' partition

5 - change `5' partition

6 - change `6' partition

7 - change `7' partition

select - select a predefined table

modify - modify a predefined partition table

name - name the current table

print - display the current table

label - write partition map and label to the disk

!<cmd> - execute <cmd>, then return

quit

partition> 1

Part Tag Flag Cylinders Size Blocks

1 unassigned wm 0 0 (0/0/0) 0

Enter partition id tag[unassigned]:

Enter partition permission flags[wm]:

Enter new starting cyl[0]:

Enter partition size[0b, 0c, 0.00mb, 0.00gb]: 2.00gb

partition> l

Ready to label disk, continue? y

partition> p

Current partition table (unnamed):

Total disk cylinders available: 13814 + 2 (reserved cylinders)

Part Tag Flag Cylinders Size Blocks

0 unassigned wm 0 0 (0/0/0) 0

1 unassigned wm 0 - 3236 2.00GB (3237/0/0) 4195152

partition> q

Copy the data on vol01 to the newly created disk partition.

# dd if=/dev/vx/dsk/voldg/vol01 of=/dev/dsk/c1t12d0s1

In the /etc/vfstab file, remove the following entry.

/dev/vx/dsk/voldg/vol1 /dev/vx/rdsk/voldg/vol1 /vol1 vxfs 4 yes rw

Replace it with an entry for the newly created partition.

/dev/dsk/c1t12d0s1 /dev/rdsk/c1t12d0s1 /vol01 vxfs 4 yes rw

Mount the disk partition.

# mount -F vxfs /dev/dsk/c1t12d0s1 /vol01

Remove vol01 from VERITAS Volume Manager.

# vxedit -rf rm /dev/vx/dsk/voldg/vol01

To complete the procedure, follow Steps 10 through 12 in the previous section, Moving volumes to disk partitions.

Shutting down VERITAS Volume Manager

To shut down VERITAS Volume Manager

Enter the vxdctl and vxiod commands as follows:
# vxdctl stop

# vxiod -f set 0


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