IT38764: RDQM configured for both HA and DR is unable to run on any nodeafter frequent connection interruptions

APAR status

• Closed as program error.

Error description

• After some frequent queue manager restarts caused due to network
  interruption the replicated data queue manager (RDQM) goes into
  failed state and does not run on any node.
  The DRBD status of the queue manager that fails to start on the
  Primary node will look like this.
  
  qm1 role:Primary
    disk:UpToDate
    vm05.ibm.com role:Secondary
      peer-disk:UpToDate
    mqhavm06.hursley.ibm.com role:Secondary
      peer-disk:UpToDate
  
  qm1.dr role:Secondary
    disk:Diskless quorum:no
    _remote connection:Connecting
  

Local fix

• Suspend the primary node then resume it.
  
  rdqmadm -s
  rdqmadm -r
  

Problem summary

• ****************************************************************
  USERS AFFECTED:
  All MQ users who have configured RDQM for high availability (HA)
  and disaster recovery (DR).
  
  
  Platforms affected:
  Linux on x86-64
  
  ****************************************************************
  PROBLEM DESCRIPTION:
  The repeated loss and regain of quorum which results in queue
  manager resource restarts caused the DRBD disk state of the DR
  resource to become stuck in diskless state and did not allow the
  queue manager to be started on the HA Primary node.
  

Problem conclusion

• The code has been modified to recover automatically from the
  diskless state in the above situation.
  
  ---------------------------------------------------------------
  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 BASE V9.2

• Fixed component ID

  5724H7281

Applicable component levels