IT30354: MQ Appliance reloads if the queue manager file system is accessed using REST API during queue manager fail over.

APAR status

• Closed as program error.

Error description

• The MQ appliance reloads while a queue manager failover is in
  progress.
  
  Similar errors as below can be seeing on the message logs under
  trace directory
  
  
  Sep 13 08:15:28 mqapp01 Filesystem(QM1_fs)[1469726]: INFO:
  Running stop for /dev/drbd/by-res/drbd_QM1 on /var/mqm/vols/QM1
  Sep 13 08:15:28 mqapp01 Filesystem(QM1_fs)[1469726]: INFO:
  Trying to unmount /var/mqm/vols/QM1
  Sep 13 08:15:28 mqapp01 Filesystem(QM1_fs)[1469726]: ERROR:
  Couldn't unmount /var/mqm/vols/QM1; trying cleanup with TERM
  Sep 13 08:15:28 mqapp01 Filesystem(QM1_fs)[1469726]: INFO:
  sending signal TERM to: root    85657   482 91 Aug24
  ttyS0  S<sl+ 25563:34 /root/drouter --listen -S0 -F0
  Sep 13 08:15:29 mqapp01 supervisor: Restart event for process
  drouter (PID 85657) - Reason: (2) Signal info: PID (85657)
  Signal (17) Status (9)(EXIT(-1) SIG(9) CORE(0))
  Sep 13 08:15:36 mqapp01 Filesystem(QM1_fs)[1469726]: INFO:
  unmounted /var/mqm/vols/QM1 successfully
  

Local fix

• Use Log Target feature instead to transfer queue manager logs.
  

Problem summary

• ****************************************************************
  USERS AFFECTED:
  MQ Appliance users who use the REST API to access queue manager
  error logs while an HA failover is in progress.
  
  
  Platforms affected:
  MultiPlatform
  
  ****************************************************************
  PROBLEM DESCRIPTION:
  While processing a queue manager failover any process that is
  holding a lock on the queue manager file system is killed
  immediately. In this case the lock was held by the drouter
  process and killing this process results in the reload.
  

Problem conclusion

• The code is modified to allow the drouter process to finish its
  work and release the lock on the queue manager file system.
  
  MQ appliances users are recommended to apply the fix for the
  APAR IT33612 with the fix for APAR IT30354 as IT33612 might
  cause some of the changes added by IT30354 ineffective.
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
  Version    Maintenance Level
  v9.1 CD    9.1.5
  v9.1 LTS   9.1.0.7
  
  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