IT41018: IBM MQ appliance queue manager writes might be slower than normal during resync

APAR status

• Closed as program error.

Error description

• When the IBM MQ appliance HA or DR queue manager synchronizes
  the data from active node to standby or DR node node the writes
  from live traffic might slower than normal, which will impact
  the overall queue manager performance.
  

Local fix

• Make any HA/DR change during quiet period i.e. when the load is
  not high.
  

Problem summary

• ****************************************************************
  USERS AFFECTED:
  Users using queue managers in HA/DR in MQ appliance
  
  
  Platforms affected:
  MultiPlatform
  
  ****************************************************************
  PROBLEM DESCRIPTION:
  When MQ appliance queue manager resynced data(i.e. synchronized
  data from active node to standby due to the initial sync or a
  catch-up sync following a period of disconnection) the resync
  was getting priority over the live replication and this
  negatively affected the overall queue manager performance.
  

Problem conclusion

• MQ appliance code has been modified to balance the replication
  network bandwidth between all the catch up sync data and any new
  writes.
  ----------------------------------------------------------------
  The fix is targetted in the following PTFs :
  
  Version    Maintenance Level
  v9.3 CD    9.3.0.0
  v9.2 LTS   9.2.0.7
  
  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 APPL M2002 V

• Fixed component ID

  5737H4701

Applicable component levels