PM63802: READ-AHEAD

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APAR status

  • Closed as program error.

Error description

  • Read-ahead improvements.
    .
    Additional keywords:
    QRep
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED: All users of WebSphere MQ for z/OS Version   *
    *                 7 Release 0 Modification 1 and Version 7     *
    *                 Release 1                                    *
    ****************************************************************
    * PROBLEM DESCRIPTION: InfoSphere Data Replication, Q          *
    *                      Replication slows down when MQ transmit *
    *                      queue or Q Replication apply queues     *
    *                      become deep.                            *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    New bufferpool read ahead function is provided to pre-stage
    messages from deep queues into the MQ buffer pool to improve
    performance of Q Replication.
    

Problem conclusion

  • Users of Q Replication can enable the buffer pool read ahead
    function for the queue managers hosting Q Replication
    transmission and apply queues with the MQSC command:
     RECOVER QMGR(TUNE READAHEAD ON)
    
    The function can be activated dynamically by entering at a
    console, or, added to the queue manager configuration by adding
    to a file processed in the CSQINP2 concatenation during queue
    manager start up.
    010Y
    100Y
    CSQIEXTC
    CSQIIANC
    CSQIINS7
    CSQIMGEF
    CSQIMGE1
    CSQIMGE9
    CSQIRAHP
    CSQIRECP
    CSQMGET
    CSQMHNDL
    CSQMOPEN
    CSQMOPNI
    CSQPMTRM
    CSQP1RAH
    CSQP2GET
    

Temporary fix

Comments

APAR Information

  • APAR number

    PM63802

  • Reported component name

    WMQ Z/OS V7

  • Reported component ID

    5655R3600

  • Reported release

    010

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    YesSpecatt / New Function

  • Submitted date

    2012-05-03

  • Closed date

    2012-06-27

  • Last modified date

    2013-09-25

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

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

    UK79853 UK79854

Modules/Macros

  •    CSQIEXTC CSQIIANC CSQIINS7 CSQIMGEF CSQIMGE1
    CSQIMGE9 CSQIRAHP CSQIRECP CSQMGET  CSQMHNDL CSQMOPEN CSQMOPNI
    CSQPMTRM CSQP1RAH CSQP2GET
    

Fix information

  • Fixed component name

    WMQ Z/OS V7

  • Fixed component ID

    5655R3600

Applicable component levels

  • R010 PSY UK79853

       UP12/07/13 P F207

  • R100 PSY UK79854

       UP12/07/13 P F207

Fix is available

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Document information


More support for:

z/OS family

Software version:

7.0.1

Reference #:

PM63802

Modified date:

2013-09-25

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