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PI37613: CORRECT DB2 WLB FORMULA FOR IDAA V4 SUPPORT

A fix is available

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APAR status

  • Closed as program error.

Error description

  • Correct DB2 WLB formula for IDAA V4 support.
    ***************************************************************
    Additional Symptoms and Keywords:
      IDAA  IDAAV4R1/K
      Work Load Balancing WLB
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED: All DB2 for z/OS users who use IBM DB2       *
    *                 Analytics Accelerator (IDAA).                *
    *                 Specifically those that have two or more     *
    *                 IDAA V4 (or higher) accelerators.            *
    ****************************************************************
    * PROBLEM DESCRIPTION: Incorrect balancing of work to IDAA V4  *
    *                      accelerators when they are shared by    *
    *                      other DB2 for z/OS subsystems.          *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    When two or more IDAA V4 accelerators are available for
    offloading, DB2 utilizes a Work Load Balancing (WLB) technique
    to distribute work to the accelerators based on their current
    load.  However, when the accelerators are shared by multiple
    DB2 subsystems, work to the accelerators may not be properly
    balanced.
    DB2 processing to balance work load among accelerators is not
    behaving as expected because an incorrect system monitor value
    is being used to calculate the accelerator loading factor. This
    can cause work to be offloaded to an incorrect accelerator.
    

Problem conclusion

  • DB2 Accelerator Work Load Balancing processing has been changed
    to apply the proper system monitor value when calculating the
    accelerator loading factor.
    

Temporary fix

Comments

APAR Information

  • APAR number

    PI37613

  • Reported component name

    DB2 OS/390 & Z/

  • Reported component ID

    5740XYR00

  • Reported release

    A10

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2015-03-23

  • Closed date

    2015-04-20

  • Last modified date

    2015-06-01

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

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

    UI26900 UI26901

Modules/Macros

  •    DSNX8WAC
    

Fix information

  • Fixed component name

    DB2 OS/390 & Z/

  • Fixed component ID

    5740XYR00

Applicable component levels

  • RA10 PSY UI26900

       UP15/05/06 P F505

  • RB10 PSY UI26901

       UP15/05/06 P F505

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.



Document information

More support for: DB2 for z/OS

Software version: A10

Reference #: PI37613

Modified date: 01 June 2015


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