IT36491: RDQM creation might fail due to port conflict

APAR status

• Closed as program error.

Error description

• The problem started when a new queue manager was created  with
  DR port 7094.
  
  Internally RDQM uses ports between 7000 to 7100 for its HA drbd
  replication connections. Coincidentally the port picked for the
  HA connection was also 7094 and hence this caused a conflict in
  the configuration.
  
  The following errors may be observed:
  
  Creating replicated data queue manager configuration fails with.
  
  AMQ3817E: Replicated data subsystem call '/usr/sbin/drbdadm --
  --force
  create-md qm1' failed with return code '10'.
  /etc/drbd.d/qm1.res:0: in resource qm1
  ipv4:123.456.789.111:7094 is also used
  /etc/drbd.d/qm1.dr.res:31 (resource qm1.dr)
  AMQ3812E: Failed to create replicated data queue manager
  configuration.
  
  The drbdadm-status output for the node shows the following
  status:
  
      # No currently configured DRBD found.
  

Local fix

Problem summary

• ****************************************************************
  USERS AFFECTED:
  All IBM MQ users using RDQM feature.
  
  
  Platforms affected:
  Linux on x86-64
  
  ****************************************************************
  PROBLEM DESCRIPTION:
  During the creation of an RDQM queue manager, MQ picked a port
  for the DRBD connection which was already in use by the queue
  manager for the DR connection.  The queue manager failed to
  check whether the port was already in use.
  

Problem conclusion

• The code has been modified to validate the port number before
  assigning it for use by a new RDQM for its DRBD connection.
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
  Version    Maintenance Level
  v9.2 LTS   9.2.0.3
  v9.x CD    9.2.3
  
  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