PH68566: SMF TIMER POPS BEFORE THE QMGR INITIAL CHECKPOINT FOLLOWING QMGR RESTART.

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• SMF timer pops before the QMGR has been through the initial
  checkpoint following QMGR restart. Looping can occur . Some
  conditions can prevent initial checkpoint from occurring. In
  this case it was DB2 being unavailable or down. The log showed
  CSQ5003A message.
  

Local fix

• Setting STATIME=0, ACCTIME=0 in the ZPRM should prevent this
  problem.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of IBM MQ for z/OS Version 9       *
  *                 Release 4 Modification 0.                    *
  ****************************************************************
  * PROBLEM DESCRIPTION: High CPU during queue manager startup   *
  *                      when SMF Statistics or Accounting is    *
  *                      enabled.                                *
  ****************************************************************
  During queue manager initialisation the SMF timer task
  establishes a STIMER for the periodic generation of SMF records.
  If queue manager startup is delayed prior to the startup
  checkpoint (for example, while waiting for DB2 to become
  available in a Queue Sharing Group), and the initial STIMER
  interval expires, or SET SYSTEM changes the accounting or
  statistics interval, the SMF timer task incorrectly
  reestablishes the STIMER with a very short interval. This leads
  to the SMF timer task waking up almost immediately and
  repeatedly reestablishing the short STIMER, until the start up
  checkpoint has occurred.
  

Problem conclusion

• The SMF timer task correctly calculates the intended STIMER
  interval when waking prior to the startup checkpoint.
  

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:

  UO06201

Modules/Macros

• CSQWVSBH
  

Fix information

• Fixed component name

  IBM MQ Z/OS V9

• Fixed component ID

  5655MQ900

Applicable component levels

• R400 PSY UO06201

     UP26/01/10 P F601 ¢

Fix is available

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