PH37593: PROVIDE A CHECK TO DETERMINE IF A 64K HIOP BUFFER SIZE IS DEFINED AT STARTUP

Obtain the fix for this APAR.

APAR status

• Closed as new function.

Error description

• This modification will check to determine if the 64K HIOP buffer
  size is defined in the IMS control region during IMS
  initialization. If the 64K HIOP buffer size is not defined,
  we'll issue a message and continue processing normally.
  
  QCF requests HIOP buffers that are larger than 32K each time an
  IMS Queue Control Facility function is executed.  For a
  performance benefit, it is recommended that the 64K HIOP buffer
  be defined.
  
  We will also add a topic about replacing the HIOP buffer
  definitions to the QCF User's Guide.
  
  This change came about due to IMS APAR/PTF PH30072/UI73919 that
  adds 64K buffers to the default.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All IBM IMS Queue Control Facility for z/OS  *
  *                 Version 3 Release 2 (FMID=H0GN320) users.    *
  ****************************************************************
  * PROBLEM DESCRIPTION: This modification adds to check to      *
  *                      determine if the 64K HIOP buffer size   *
  *                      is defined in the IMS control region    *
  *                      during IMS initialization.              *
  *                      If the 64K HIOP buffer size is not      *
  *                      defined, QCF issues a warning message   *
  *                      and continues processing normally.      *
  *                                                              *
  *                      It also adds a topic about replacing    *
  *                      the HIOP buffer definitions to the QCF  *
  *                      User's Guide.                           *
  ****************************************************************
  * RECOMMENDATION: Apply the maintenance for this APAR.         *
  ****************************************************************
  QCF requests HIOP buffers that are larger than 32K each time an
  IMS Queue Control Facility function is executed.
  For a performance benefit, it is recommended that the 64K HIOP
  buffer be defined.
  
  This modification adds to check to determine if the 64K HIOP
  buffer size is defined in the IMS control region during IMS
  initialization.
  If the 64K HIOP buffer size is not defined, QCF issues a
  warning message and continues processing normally.
  
  It also adds a topic about replacing the HIOP buffer
  definitions to the QCF User's Guide.
  

Problem conclusion

Temporary fix

Comments

• While the IMS control region is being started, QCF checks
  whether a 64 KB HIOP buffer is defined. If not, it issues
  warning message IQC6221W, and the startup processing continues.
  

APAR Information

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

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

  UI76094

Modules/Macros

• IQCC1ENU IQCCIN0E IQCCIN0F IQCCSCHE IQCCSCHF IQCSIN10
  

Fix information

• Fixed component name

  IMS QUEUE CNTL

• Fixed component ID

  5697E9900

Applicable component levels

• R320 PSY UI76094

     UP21/07/01 P F106

Fix is available

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