IT25353: IBM MQ Appliance configured for High Availability sees HA Ethernet Interfaces drop and enters a partitioned state

APAR status

• Closed as program error.

Error description

• Two IBM MQ Appliances running 9.0.5 firmware were connected in a
  High Availability (HA) configuration.  One of the Appliances
  reported that HA ethernet interfaces had dropped, after which it
  entered
  a partitioned state:
  .
    ADDRCONF(NETDEV_UP): eth17: link is not ready
    ADDRCONF(NETDEV_UP): eth13: link is not ready
    drbd: PingAck did not arrive in time.
    drbd peer( Primary -> Unknown ) conn ( Connected ->
      NetworkFailure ) pdsk ( UptoDate -> DUnknown)
    block drbd: Split-Brain detected but unresolved,
      dropping connection!
  .
  .
  When the other IBM MQ Appliance in the HA pair is checked, the
  'show time' command indicates it reloaded itself:
  .
    mqa# show time
  .
        Local time: Tue Jun 12 02:56:45 2018
         Time zone: EDT
    Time zone spec: EST5EDT,M3.2.0/2:00,M11.1.0/2:00
    Uptime: reload: 0 days 03:22:58
    Uptime: reboot: 24 days 18:53:11
  

Local fix

Problem summary

• ****************************************************************
  USERS AFFECTED:
  Users using the IBM MQ Appliance
  
  
  Platforms affected:
  MultiPlatform
  
  ****************************************************************
  PROBLEM DESCRIPTION:
  An internal MQ reload caused the IBM MQ Appliances using HA to
  go into partitioned state.
  

Problem conclusion

• The IBM MQ Appliance code has been modified to avoid the
  internal reload.
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
  Version    Maintenance Level
  v9.1 CD    9.1.1
  v9.1 LTS   9.1.0.1
  
  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

  IBM MQ APPL M20

• Fixed component ID

  5725Z0900

Applicable component levels