OA58514: MSGIRA205I OR AUXILIARY STORAGE SHORTAGE DETECTED EVEN THOUGH LOCAL PAGE DATA SETS SHOW FEW SLOTS IN USE.

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• MsgIRA205I may be issued, or an auxiliary storage shortage
  detected, when in fact there are plenty of available slots on
  the local page data sets.
  When high virtual shared pages are paged out to auxiliary, the
  slot counts in ASMNVSC and RASP's ASSBNVSC are incremented.
  During DETACH AFFINITY=SYSTEM for a high virtual memory object
  which has such paged-out pages, these slots must be freed.
  However, when IAXVD calls ILRFRSLS to free them, it passes a
  zero ASCB address, which causes ILRFRSLS to NOT decrement either
  ASMNVSC or ASSBNVSC.  Since ASMNVSC is used to determine total
  aux storage usage, it will therefore have an incorrectly high
  value.  It is possible for this value to get high enough that
  msgIRA205I may be issued, or even cause an auxiliary storage
  shortage to be detected.
  
  ANALYSIS:
  IAXVD
  
  VERIFICATION STEPS:
  D ASM shows local page data sets have low utilization, yet total
  utilization is high.  ASMNVSC is greater than the total number
  of slots in use in all local page data sets.
  

Local fix

• BYPASS/CIRCUMVENTION:
  Apply fixing PTF when available.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * Users of HBB77B0 and up.                                     *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * MSGIRA205I OR AUXILIARY STORAGE SHORTAGE DETECTED EVEN       *
  * THOUGH LOCAL PAGE DATA SETS SHOW FEW SLOTS IN USE.           *
  *                                                              *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  When high virtual shared pages are paged out to auxiliary, the
  slot counts in ASMNVSC and RASP's ASSBNVSC are incremented.
  During DETACH AFFINITY=SYSTEM for a high virtual memory object
  which has such paged-out pages, these slots must be freed.
  Detach code fails to decrement these counts. Since ASMNVSC is
  used to determine total aux storage usage,  the count may get
  high enough that msgIRA205I is issued, or an auxiliary storage
  shortage detected.
  

Problem conclusion

• The code in IAXVD which handles Detach of high virtual shared
  pages and high virtual common storage which has some paged-out
  pages to AUX storage (DASD or SCM), is corrected to correctly
  decrement the ASMNVSC and RASP's ASSBNVSC counts.
  

Temporary fix

• *********
  * HIPER *
  *********
  

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

  UJ02352 UJ02353

Modules/Macros

• IAXVT    IAXVD    IAXUS    IAXGA    IAXDY    IAXVN    IAXPR
  IAXUX    IAXVF    IAXDR
  

Fix information

• Fixed component name

  RSM - REAL STOR

• Fixed component ID

  5752SC1CR

Applicable component levels

• R7B0 PSY UJ02352

     UP20/03/25 P F003 ¢

• R7C0 PSY UJ02353

     UP20/03/25 P F003 ¢

Fix is available

• Select the PTF appropriate for your component level. You will be required to sign in. Distribution on physical media is not available in all countries.