IJ22962: POTENTIAL UNDETECTED DATA CORRUPTION IN A POWERHA PARTITIONED CL

PowerHA-7.2.4 SP1

APAR status

• Closed as program error.

Error description

• **************************************************************
  * USERS AFFECTED:
  * Systems running PowerHA 7.2.4 with
  * cluster.es.server.rte at 7.2.4.0.
    **************************************************************
  * ERROR DESCRIPTION:
  * If a partition occurs in a PowerHA cluster, there is
  * potential for undetected data corruption if both sides of
  * the partition attempt to access the shared storage.
  *
  * Under certain timing and load conditions the existing
  * mechanisms used to prevent this problem may not function in
  * a timely manner in order to effectively isolate the shared
  * storage.
  *
  * This problem can occur with all versions of PowerHA and
  * all cluster types (standard, stretched or linked) with
  * shared storage configurations.
  *
  * You will need to apply the PowerHA fix to avoid this
  * problem.
  * You may also need a fix for CAA depending on the version of
  * AIX you are using.
  * If you need to do any additional tuning of the fix you will
  * also need a fix for RSCT.
  * See the tables below for the specific combination of fixes
  * you will need.
    **************************************************************
  * RECOMMENDATION:
  * Install APAR IJ22962.
  * Prior to fix availability, an interim fix is available from
  * either
  * ftp://aix.software.ibm.com/aix/ifixes/ij22962/
  * https://aix.software.ibm.com/aix/ifixes/ij22962/
  * Installation of the ifix does not require a reboot.
    **************************************************************
  

Local fix

• NA
  

Problem summary

• In a PowerHA cluster configuration, which includes
  mutual-takeover resource groups and more than 1 resource group
  exist on the same critical resource group node, the disk fencing
  and other split/merge policies malfunctions in a particular
  cluster scenario.
  

Problem conclusion

• Modified to address the problems with split/merge policies with
  and without the quarantine policies.
  This fix addresses all the problems with split/merge scenarios
  and make sure there is no data corruption when split or merge
  occurs.
  

Temporary fix

• Not available
  

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

  IJ22627

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  POWERHA SYSMIR

• Fixed component ID

  5765H3900

Applicable component levels