IT36745: IBM MQ Appliance HA queue manager does not return to its preferred node after unexpected fail over

APAR status

• Closed as program error.

Error description

• The cluster manager process terminates unexpectedly due to an
  internal error and triggers the queue managers to failover to
  the Secondary node and continues to run there even though its
  preferred node is online again.
  
  Below errors were recorded in the system log that triggers the
  failover.
  
  2021-04-21 13:13:19.374056+00:00 MQAPP1 crmd[861101]:    error:
   Could not recover from internal error
  2021-04-21 13:13:19.376296+00:00 MQAPP1 pacemakerd[860937]:
  error: crmd[861101] exited with status
  201 (Generic Pacemaker error)
  2021-04-21 13:13:19.376375+00:00 MQAPP1 pacemakerd[860937]:
  notice: Respawning failed child process:
  crmd
  

Local fix

• Suspend and resume from the HA the node where the queue
  managers are now running.
  

Problem summary

• ****************************************************************
  USERS AFFECTED:
  All MQ Appliance users with one or more queue managers
  configured in an HA group.
  
  
  Platforms affected:
  MultiPlatform
  
  ****************************************************************
  PROBLEM DESCRIPTION:
  When cluster process terminates unexpectedly some of the
  transient attributes which determine the eligibility of the node
  to run the cluster resources were lost. As a result the of this
  the queue manager was unable to move back to its preferred node
  even though the node was online again.
  

Problem conclusion

• The code has been improved such that the missing transient
  attributes are restored in the event of an unexpected failure.
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
  Version    Maintenance Level
  v9.2 LTS   9.2.0.5
  v9.x CD    9.2.5
  
  The latest available maintenance can be obtained from
  'WebSphere MQ Recommended Fixes'
  http://www-1.ibm.com/support/docview.wss?rs=171&uid=swg27006037
  
  If the maintenance level is not yet available information on
  its planned availability can be found in 'WebSphere MQ
  Planned Maintenance Release Dates'
  http://www-1.ibm.com/support/docview.wss?rs=171&uid=swg27006309
  ---------------------------------------------------------------
  

Temporary fix

Comments

APAR Information

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

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

Fix information

• Fixed component name

  MQ APPL M2002 V

• Fixed component ID

  5737H4701

Applicable component levels