IT34737: IBM MQ Appliance HA Queue manager configured for DR restarts/fails over unexpectedly

APAR status

• Closed as program error.

Error description

• IBM MQ Appliance HA Queue manager restarted unexpectedly. The
  messages logs
  indicates that at the time of the issue, the DR_ping_monitor
  process Timed Out and causes the queue manager to
  restart/failover
  
  Oct 26 07:01:13 MQAPP01 lrmd[21715]:  warning:
  QM1_DR_ping_monitor_20000 process (PID 388342) timed out
  Oct 26 07:01:13 MQAPP01 lrmd[21715]:  warning:
  QM1_DR_ping_monitor_20000:388342 - timed out after 10000ms
  Oct 26 07:01:14 MQAPP01 pengine[21717]:  warning: Processing
  failed monitor of QM1_DR_ping:1 on MQAPP01: unknown error
  
  Oct 26 07:01:40 MQAPP01 lrmd[21715]:  notice:
  QM1_stop_0:394620:stderr [ IBM MQ Appliance queue manager 'QM1'
  ending. ]
  Oct 26 07:01:40 MQAPP01 lrmd[21715]:  notice:
  QM1_stop_0:394620:stderr [ IBM MQ Appliance queue manager 'QM1'
  ended. ]
  
  Oct 26 07:01:46 MQAPP01 lrmd[21715]:  notice:
  QM1_start_0:410673:stderr [ IBM MQ Appliance queue manager
  'QM1' starting. ]
  Oct 26 07:01:46 MQAPP01 lrmd[21715]:  notice:
  QM1_start_0:410673:stderr [ IBM MQ Appliance queue manager
  'QM1' started using V9.1.0.6. ]
  

Local fix

Problem summary

• ****************************************************************
  USERS AFFECTED:
  Users using IBM MQ Appliance for High Availability(HA) and
  Disaster Recovery (DR)
  
  
  Platforms affected:
  MultiPlatform
  
  ****************************************************************
  PROBLEM DESCRIPTION:
  The DR Ping monitor process that periodically checks the health
  of the DR connection could time out when the system experienced
  High CPU load. This caused the HA queue manager to be restarted
  or failed over.
  

Problem conclusion

• Improvements are made to DR ping monitor code to prevent it from
  timing out in this scenario.
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
  Version    Maintenance Level
  v9.1 LTS   9.1.0.8
  
  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 APPLIANCE M2

• Fixed component ID

  5737H4700

Applicable component levels