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IC65157: FDCS REPORT "ACCESS DENIED" ERRORS AFTER QMGR FAILURE AND FAILOVER IN A MSCS ENVIRONMENT.

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APAR status

  • Closed as program error.

Error description

  • An FDC with Probe ID XY513001 is produced in an MSCS
    environment immediately after the queue manager fails over to
    the other node. The FDC contains the following comment and
    stack:
    Comment1          :- WinNT error 5 from CreateFile.
    Comment2          :- Access is denied.
    
    MQM Function Stack
    CMQDAICmdServerService::UpdateStatus
    lpiSPIQueryQMStatus
    zutQueryQMFileLocks
    xcsQueryFileLock
    xcsFFST
    

Local fix

Problem summary

  • ****************************************************************
    USERS AFFECTED:
    Any users of WebSphere MQ experiencing expected/unexpected
    failovers in an MSCS environment.
    
    Platforms affected:
    Windows
    
    ****************************************************************
    PROBLEM SUMMARY:
    A lock file has been added to WebSphere MQ to assist in
    determining the state of the queue manager, specifically for
    software HA purposes. The purpose of this lock file is
    primarily to determine whether the queue manager is active on
    another node. However, a timing condition existed whereby the
    lock file could become unavailable during an MSCS failover in a
    hardware HA setup as the disk hosting the lock file transited
    to the standby node. Under these circumstances, attempts to
    access the lock file will fail with ACCESS DENIED errors. This
    is a valid scenario and an FDC should not be produced under
    such circumstances.
    

Problem conclusion

  • WebSphere MQ was modified to suppress the production of an FDC
    under the outlined scenario. Instead, attempts to read the lock
    file which result in ACCESS DENIED errors are treated as if the
    lock file is currently locked, and therefore that the queue
    manager is on another node.
    
    ---------------------------------------------------------------
    The fix is targeted for delivery in the following PTFs:
    
                       v7.0
    Platform           Fix Pack 7.0.1.2
    --------           --------------------
    Windows            U200316
    
    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

    IC65157

  • 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

    2009-12-15

  • Closed date

    2010-01-14

  • Last modified date

    2010-01-14

  • 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

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Document Information

Modified date:
14 January 2010