PH06787: AFTER CHANGES IMPLEMENTED VIA Z/OS APAR OA53037 STORAGE MESSAGES CSQY220I CSQY224I CSQY226I MAY RETURN MISLEADING DATA

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Service team finds that, after changes implemented via OA53037
  UA94775 MQ may return misleading information regarding its use
  of above the bar storage. OA53037 introduced changes where XES
  will allocate the same amount of storage for serialized list and
  lock structures however, it is now taken from 64 bit storage
  instead of via dataspaces (4G per serialized list structure
  connector and 36G per lock structure connector) MQ does not
  exclude 64 bit storage allocated with MEMLIMIT=NO. Although it
  is not necessary to change the MQ MEMLIMIT value in conjunction
  with this change introduced by XES (OA53037), it is the case
  that CSQY220I can return the additional storage amounts
  allocated by XES module IXLD1INT. This can have the knock on
  effect that CSQY224I / CSQY226I indicate a storage shortage/
  contraction condition when in fact such is not the case.
  .
  This may appear to be a storage leak, but it is not.
  *
  Additional keywords:
  QSG Queue Sharing Group
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of IBM MQ for z/OS Version 9       *
  *                 Release 1 Modification 0.                    *
  ****************************************************************
  * PROBLEM DESCRIPTION: MQ may return misleading information    *
  *                      regarding its use of above the bar      *
  *                      storage in the message CSQY220I.        *
  ****************************************************************
  MQ may return misleading information regarding its use of above
  the bar storage.
  
  The amount of above bar storage that MQ reports that it is using
  could be inflated to the point where messages CSQY224I and
  CSQY225E can be issued even when this calculation is incorrect.
  

Problem conclusion

• The formula used to calculate the amount of above bar storage
  being used by MQ has been corrected so that it now shows the
  true figure.
  

Temporary fix

Comments

APAR Information

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

  PI98759

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

  UI60621

Modules/Macros

• CSQSCTL
  

Fix information

• Fixed component name

  IBM MQ Z/OS V9

• Fixed component ID

  5655MQ900

Applicable component levels

• R100 PSY UI60621

     UP19/01/26 P F901 ¢

Fix is available

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