IT34493: MQ Appliance: After disabling eth20 interface addition of a standalone queue manager to HA at DR site fails with AMQ6546E

APAR status

• Closed as program error.

Error description

• In an environment with four MQ Appliances, where there are 2
  different HA groups at different data centers and the queue
  managers on the first data center replicates to the appliances
  in the other site (DR site), the following steps were performed
  after disabling eth20 in both appliances at the DR site.
  
  
  mqa(mqcli)# makedrprimary -m QM1
  The makedrprimary command succeeded.
  
  mqa(mqcli)# dltdrprimary -m QM1
  The dltdrprimary command succeeded.
  
  mqa(mqcli)# sethagrp -i QM1
  Removing high availability configuration on appliance
  'MQAPPDR2'.
  AMQ6589W: Failed to remove high availability configuration on
  appliance
  'MQAPPDR2'.
  The user should issue command 'dltmqm' on remote appliance
  'MQAPPDR2' when
  it becomes available.
  AMQ6546E: An internal IBM MQ Appliance error has occurred.
  
  Review of the logs for 'sethagrp -i QM1' shows that it failed
  while checking the DRDB health.
  
  2020-09-12 08:58:58.374157089-04:00:1234488:    { Entering
  drbd_check_healthy
  2020-09-12 08:58:58.377805562-04:00:1234488:     drbdadm dump
  >/dev/null
  2020-09-12 08:58:58.381669543-04:00:1234488:
  /etc/drbd.d/QM1_DR.res: in resource drbd_QM1_DR, on MQAPPDR1:
  	IP 10.43.137.13 not found on this host.
  /etc/drbd.d/QM1_DR.res: in resource drbd_QM1_DR, on MQAPPDR1:
  	IP 10.XX.YYY.ZZ not found on this host.
  2020-09-12 08:58:58.383800099-04:00:1234488:     rc(10)
  2020-09-12 08:58:58.385892706-04:00:1234488:     DRBD is not
  healthy!
  2020-09-12 08:58:58.389488658-04:00:1234488:    } Leaving
  drbd_check_healthy 113
  2020-09-12 08:58:58.394011872-04:00:1234488:   } Leaving
  createHAQM_pre 113
  
  Although QM1 is a legitimate queue manager, it is not currently
  valid because it refer to a local IP address (10.XX.YYY.ZZ)
  that doesn't exist. The IP 10.XX.YYY.ZZ is the IP for eth20 on
  MQAPPDR1 which was disabled at the time of executing sethagrp.
  

Local fix

• Enable eth20 before issuing sethagrp.
  

Problem summary

• ****************************************************************
  USERS AFFECTED:
  Users using MQ Appliance for High Availability (HA) and Disaster
  Recovery (DR)
  
  
  Platforms affected:
  MultiPlatform
  
  ****************************************************************
  PROBLEM DESCRIPTION:
  The command used to validate DRDB health wasn't working when the
  interface used wasn't available.
  

Problem conclusion

• The code has been modified to use a different command to
  validate DRDB health when the interface is absent.
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
  Version    Maintenance Level
  v9.2 LTS   9.2.0.3
  v9.x CD    9.2.2
  
  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