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IC59413: Increasing number of non-persistent data pages when using WebSphere MQ v7 Explorer with v6 queue manager on z/OS

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APAR status

  • Closed as program error.

Error description

  • There is a growing number of non-persistent data pages on a
    WebSphere MQ v6 queue manager running on z/OS being
    administered by a v7 Explorer. The longer the Explorer is
    connected to the queue manager, the larger the number of
    non-persistent data pages.
    
    The symptom on z/OS is high usage of the pageset assigned to
    AMQ.MQEXPLORER.* temporary dynamic queue(s). A CHINIT line
    trace shows MQGETs failing with RC=2 RSN=2024
    (MQRC_SYNCPOINT_LIMIT_REACHED).
    

Local fix

Problem summary

  • ****************************************************************
    USERS AFFECTED:
    This problem affects users of the WebSphere MQ v7 Explorer
    managing a WebSphere MQ v6 queue manager on z/OS
    
    Platforms affected:
    Linux (Power),Linux (s390x),Linux (x86),Linux (x86-64),
    Linux (zSeries),Windows
    
    ****************************************************************
    PROBLEM SUMMARY:
    The WebSphere MQ Explorer was not issuing an MQCMIT call, as it
    did not expect the queue manager it was connected to to have
    syncpoints enabled by default. The WebSphere MQ Explorer should
    be setting MQGMO_NO_SYNCPOINT if it is not going to issue
    MQCMITs as the z/OS default is MQGMO_SYNCPOINT for destructive
    MQGETs.
    

Problem conclusion

  • Any MQGET calls from the Explorer not to be followed by a MQCMIT
    now specify MQGMO_NO_SYNCPOINT. Messages are retrieved correctly
    and there is no build up of syncpoints and data pages.
    
    ---------------------------------------------------------------
    The fix is targeted for delivery in the following PTFs:
    
                       v7.0
    Platform           Fix Pack 7.0.1.0
    --------           --------------------
    Windows            U200306
    Linux (x86)        U823664
    Linux (x86-64)     U823773
    Linux (zSeries)    U823668
    Linux (Power)      U823666
    
    The latest available maintenance can be obtained from
    'WebSphere MQ Recommended Fixes'
    http://www-1.ibm.com/support/docview.wss?rs=171&uid=swg27006037
    
    If the maintenance level is not yet available, information on
    its planned availability can be found in 'WebSphere MQ
    Planned Maintenance Release Dates'
    http://www-1.ibm.com/support/docview.wss?rs=171&uid=swg27006309
    ---------------------------------------------------------------
    

Temporary fix

Comments

APAR Information

  • APAR number

    IC59413

  • Reported component name

    WMQ WINDOWS V7

  • Reported component ID

    5724H7220

  • Reported release

    700

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2009-01-08

  • Closed date

    2009-03-12

  • Last modified date

    2009-03-12

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

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

Fix information

  • Fixed component name

    WMQ WINDOWS V7

  • Fixed component ID

    5724H7220

Applicable component levels

  • R700 PSY

       UP

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Document Information

Modified date:
12 March 2009