IT38616: MQ Appliance HA queue manager reports partitioned state after appliance reload.

APAR status

• Closed as program error.

Error description

• An unexpected internal MQ appliance reload might cause HA queue
  managers to report a partitioned state.
  

Local fix

• Manually resolve partitioned state by issuing the
  'makehaprimary QMgrname' command.
  

Problem summary

• ****************************************************************
  USERS AFFECTED:
  All MQ Appliance users using HA configuration.
  
  
  Platforms affected:
  MultiPlatform
  
  ****************************************************************
  PROBLEM DESCRIPTION:
  Before the appliance reloads as part of recovering from a hang
  situation, it notifies the MQ HA processes to take necessary
  action for the graceful termination of the HA queue managers
  before the network interfaces go down.  However, in some
  scenarios the notification was not received by the relevant MQ
  process. As a result the  HA queue managers were able to enter a
  running state on both the nodes when the network communication
  between the system was lost during the reload. This caused the
  queue manager to go into Partitioned state.
  

Problem conclusion

• The MQ Appliance firmware is modified to improve the
  coordination between the processes during an appliance reload to
  prevent the queue managers from going into partitioned state.
  
  Separately, the trigger condition for the hung state that caused
  the reload on the appliance where this issue was observed has
  been addressed under APAR IT35810.
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
  Version    Maintenance Level
  v9.2 LTS   9.2.0.4
  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 APPL M2002 V

• Fixed component ID

  5737H4701

Applicable component levels