OA63906: SRM SQA SHORTAGE PROCESSING ALGORITHN DOES NOT RUN IN Z/OS 2.5

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• When running z/OS 2.5, the SRM algorithm that performs SQA
  shortage processing is never run.  This results in:
  - RSM'S RPB compression routine not being called
  - ENF 4 never being issued
  - messages IRA100E IRA101E IRA102I IRA103I and IRA104I never
    being issued.
  
  The ENF 4 not being issued can result in an increase in ESQA
  usage due to MMSB control blocks not being freed.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * All users of z/OS 2.5 (HBB77D0).                             *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * When running z/OS 2.5, the SRM algorithm that performs SQA   *
  *                                                              *
  * shortage processing is never run.  This results in:          *
  *                                                              *
  * - RSM'S RPB compression routine not being called             *
  *                                                              *
  * - ENF 4 never being issued                                   *
  *                                                              *
  * - messages IRA100E IRA101E IRA102I IRA103I and IRA104I never *
  *                                                              *
  *   being issued.                                              *
  *                                                              *
  *                                                              *
  *                                                              *
  * The ENF 4 not being issued can result in an increase in ESQA *
  *                                                              *
  * usage due to MMSB control blocks not being freed.            *
  *                                                              *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  With z/OS 2.5 APAR OA61240, algorithms are only scheduled when
  running under the SRM timer pop. The intent of the change was
  to prevent timed algorithms from running on a vertical low
  processors and holding the SRM lock for a prolonged period of
  time. This change resulted in the SQA algorithm never running
  on a z/OS 2.5 system.  Prior to the change, the IRARMSQA
  algorithm in IRARMST3 could get called either when running
  under the SRM timer pop or from internal sysevent processing.
  In order for the algorithm to only run periodically, the intent
  was for the algorithm not to run but to only get rescheduled
  when the routine got called from internal sysevent processing.
  However, the check to determine which path to take was not
  correct, so instead of running the algorithm when running under
  a timer pop, the algorithm is getting rescheduled.  This
  results in the SQA algorithm always being rescheduled and never
  being run on a z/OS 2.5 system.
  

Problem conclusion

• IRARMST3 has been updated to properly run the IRARMSQA
  algorithm when running under the SRM timer pop.  Since IRARMSQA
  should now only get control when running under the timer pop,
  the path to reschedule the algorithm is no longer used.
  

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:

  UJ09603

Modules/Macros

• IRARMST3 IRARMCTL
  

Fix information

• Fixed component name

  SRM - SYS RSRCE

• Fixed component ID

  5752SC1CX

Applicable component levels

• R7D0 PSY UJ09603

     UP22/11/23 P F211

Fix is available

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