IT37633: RDQM does not failover as expected when the Primary node is rebooted or when the node loses connection to its peers

APAR status

• Closed as program error.

Error description

• When failing over a queue manager operating within an RDQM HA
  cluster, the failover operation fails if the queue manager file
  system can not be unmounted in timely manner and the queue
  manager remains in stopped state on all nodes.
  

Local fix

Problem summary

• ****************************************************************
  USERS AFFECTED:
  All IBM MQ users using the RDQM feature.
  
  
  Platforms affected:
  Linux on x86-64
  
  ****************************************************************
  PROBLEM DESCRIPTION:
  As part of failover each of the cluster resources are stopped on
  the primary. The queue manager filesystem is unmounted while the
  file system resource for the queue manager is stopped. If the
  filesystem could not be unmounted then the fuser call was
  invoked to verify which process is holding the file system. If
  the fuser call did not return in timely manner then cluster
  agent marked it as a failure in stopping the file system
  resource. As a result the queue manager failover failed.
  

Problem conclusion

• The RDQM logic has been modified to use an alternative mechanism
  to verify the usage of the queue manager file system during
  failover and additional diagnostics are added to log information
  of any process that prevents unmounting of the queue manager
  file system.
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
  Version    Maintenance Level
  v9.2 LTS   9.2.0.7
  v9.x CD    9.2.4
  
  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 BASE V9.2

• Fixed component ID

  5724H7281

Applicable component levels