Quiesce IBM MQ on IBM i

Stop all queue managers. If necessary force all queue managers to stop, tidy up shared memory and end all jobs in the QMQM subsystem.

About this task

The orderly shutdown of IBM MQ is called quiescing. We need to quiesce IBM MQ to upgrade to a newer version.

To quiesce one or more queue managers:

Procedure

1. Sign on to a new interactive IBM i session, ensuring that we are not accessing any IBM MQ objects.
2. Ensure that we have:
   1. *ALLOBJ authority, or object management authority for the QMQM library.
   2. Sufficient authority to use the ENDSBS command.

3. Warn all users that we are going to stop IBM MQ.
4. Stop the mqweb server by entering the following command:

   ENDMQWEB

5. Use the ENDMQM command to quiesce all queue managers:

   ENDMQM MQMNAME(*ALL) OPTION(*CNTRLD) ENDCCTJOB(*YES) RCDMQMIMG(*YES)
   TIMEOUT( 15 )
   

   Where 15 is a timeout value in seconds. If the ENDMQM command has not completed within a reasonable period (at least 10 minutes), use the WRKMQM command. This command identifies the queue managers that are still ending. Then force each one in turn to stop by issuing:

   ENDMQM MQMNAME( QMGRNAME ) OPTION(*IMMED)
   

   Where QMGRNAME is the name of the queue manager. Complete the tidying up of shared memory by issuing the command:

   ENDMQM MQMNAME(*ALL) OPTION(*IMMED) ENDCCTJOB(*YES) RCDMQMIMG(*NO)
   TIMEOUT( 15 )
   

6. If the command in the previous step does not complete, end the subsystem immediately by issuing:

   ENDSBS SBS(QMQM) OPTION(*IMMED)
   

7. If this command also fails, use the operating system command ENDJOB to end all jobs in the subsystem QMQM, as described in the following steps. Note: Do not use ENDJOBABN unless you intend to perform an IPL on the machine before starting IBM MQ. Ending IBM MQ jobs using ENDJOBABN can lead to damaged semaphores, which in turn can prevent your queue manager from starting.
   1. If a QMGR must be shut down manually, the recommended order of ending jobs (ENDJOB) is shown in the list that follows. Wait a few minutes for AMQA* or AMQZ* jobs to tidy up.
      1. RUNMQLSR - TCP listener (multi-threaded)
      2. AMQCLMAA - TCP listener (single-threaded)
      3. AMQRMPPA - Channel process pooling job
      4. RUNMQCHI - channel initiator
      5. AMQCRSTA - receiving MCA jobs
      6. RUNMQCHL - sending MCA jobs
      7. AMQCRS6B - LU62 receiver channel
      8. AMQPCSEA - command server
      9. RUNMQTRM - Application trigger monitor
      10. RUNMQDLQ - Dead letter queue handler
      11. AMQFCXBA - IBM Integration Bus Worker Job
      12. AMQFQPUB - Queued Publish/Subscribe Daemon
      13. RUNMQBRK - IBM Integration Bus Control Job
      14. AMQZMUC0 ('0' is a zero) - Utility Manager
      15. AMQZMUF0 ('0' is a zero) - Utility Manager
      16. AMQZMUR0 ('0' is a zero) - Utility Manager
      17. AMQZMGR0 ('0' is a zero) - Process Controller
      18. AMQRRMFA - cluster repository manager
      19. AMQZDMAA - deferred message manager
      20. AMQALMPX - Log Manager
      21. AMQZFUMA - object authority manager
      22. AMQZLSA0 ('0' is a zero) - LQM agents
      23. AMQZLAA0 ('0' is a zero) - LQM agents
      24. AMQZXMA0 ('0' is a zero) - Execution Controller

   2. Issue the following command:

      ENDMQM MQMNAME( QMGRNAME ) OPTION(*IMMED)
      

   3. Issue the following command:

      ENDMQM MQMNAME(*ALL) OPTION(*CNTRLD) ENDCCTJOB(*YES) RCDMQMIMG(*NO)
      TIMEOUT( 05 )
      

      Where 05 is a timeout value in seconds.
   4. Manually clean up shared memory. Issue the following command:

      EDTF '/QIBM/UserData/mqm/qmgrs'
      

      then:
      1. Take option 5 for &SYSTEM and check that the following directories are empty: isem, esem, msem, ssem, and shmem.
      2. Take option 5 for QMGRNAME and check that the following directories are empty:- isem, esem, msem, ssem, and shmem.
      3. Take option 5 for &ipcc in the QMGRNAME directory and check that the following directories are empty:- isem, esem, msem, ssem, and shmem.
      4. Take option 5 for &qmpersist in the QMGRNAME directory and check that the following directories are empty:- isem, esem, msem, ssem, and shmem.
      5. Take option 5 for &app and check that the following directories are empty: isem, esem, msem, ssem, and shmem.

Parent topic: Migrating a queue manager to the latest version on IBM i