* * * READ ME * * *
              * * * Veritas Oracle Disk Manager 7.2 * * *
                         * * * Patch 100 * * *
                         Patch Date: 2017-05-29


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
----------
Veritas Oracle Disk Manager 7.2 Patch 100


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


PACKAGES AFFECTED BY THE PATCH
------------------------------
VRTSodm


BASE PRODUCT VERSIONS FOR THE PATCH
-----------------------------------
   * Veritas InfoScale Storage 7.2
   * Veritas InfoScale Enterprise 7.2


SUMMARY OF INCIDENTS FIXED BY THE PATCH
---------------------------------------
Patch ID: 7.2.0.100
* 3910095 (3757609) CPU usage going high because of contention over ODM_IO_LOCK


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

Patch ID: 7.2.0.100

* 3910095 (Tracking ID: 3757609)

SYMPTOM:
High CPU usage because of contention over ODM_IO_LOCK

DESCRIPTION:
While performing ODM IO, to update some of the ODM counters we take
ODM_IO_LOCK which leads to contention from multiple  of iodones trying to update
 these counters at the same time. This is results in high CPU usage.

RESOLUTION:
Code modified to remove the lock contention.



INSTALLING THE PATCH
--------------------
Run the Installer script to automatically install the patch:
-----------------------------------------------------------
Please be noted that the installation of this P-Patch will cause downtime.

To install the patch perform the following steps on at least one node in the cluster:
1. Copy the patch odm-aix71-Patch-7.2.0.100.tar.gz to /tmp
2. Untar odm-aix71-Patch-7.2.0.100.tar.gz to /tmp/hf
    # mkdir /tmp/hf
    # cd /tmp/hf
    # gunzip /tmp/odm-aix71-Patch-7.2.0.100.tar.gz
    # tar xf /tmp/odm-aix71-Patch-7.2.0.100.tar
3. Install the hotfix(Please be noted that the installation of this P-Patch will cause downtime.)
    # pwd /tmp/hf
    # ./installVRTSodm720P100 [<host1> <host2>...]

You can also install this patch together with 7.2 base release using Install Bundles
1. Download this patch and extract it to a directory
2. Change to the Veritas InfoScale 7.2 directory and invoke the installer script
   with -patch_path option where -patch_path should point to the patch directory
    # ./installer -patch_path [<path to this patch>] [<host1> <host2>...]

Install the patch manually:
--------------------------
AIX maintenance levels and APARs can be downloaded from the
    IBM Web site:
        http://techsupport.services.ibm.com
    Install the VRTSodm.bff patch if VRTSodm is
    already installed at fileset level 7.2.0.000
    A system reboot is recommended after installing this patch.
    To apply the patch,
    then enter these commands:
        # mount | grep odm
        # cd <patch_location>   
        # installp -aXd VRTSodm.bff VRTSodm


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/uninstallVRTSodm720P100 [<host1> <host2>...]

Remove the patch manually:
-------------------------
If you need to remove the patch, then enter these commands:
    file systems, then enter these commands:
        # mount | grep odm
        # installp -r VRTSodm 7.2.0.100
        # reboot


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


OTHERS
------
NONE