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IV15312: Too many FDC records written for the same problem. Probe Id is HL062054. Function is mqlCreateExtent.

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APAR status

  • Closed as program error.

Error description

  • /var/mqm/errors became filled up because of numerous FDC
    records with details like this.
    
    Probe Id          :- HL062054
    Component         :- mqlCreateExtent
    Major Errorcode   :- hrcE_MQLO_DISK
    MQM Function Stack
    zmuThreadMain
    zmuLogFormatTask
    mqlpgart
    mqlCreateExtent
    xcsFFST
    
    Other FDCs also seen on this occasion:
    
    HL049110/mqlpgart                          hrcE_MQLO_DISK
    HL077079/mqlReadFormatResponse             hrcE_MQLO_DISK
    HL047028/mqlAddLogFile                     hrcE_MQLO_DISK
    
    The original cause of these problems was actually outside
    WebSphere MQ, in the disk subsystem. However, WebSphere MQ
    responded by writing more FDCs than was necessary, leading to
    secondary problems because of /var/mqm/errors filling up.
    

Local fix

  • Ensure adequate system space for linear logs and ensure disk
    management by clearing out old log files.
    

Problem summary

  • ****************************************************************
    USERS AFFECTED:
    Users who experience failures in their disk subsystem (this is
    very rare).
    
    Platforms affected:
    All Distributed (iSeries, all Unix and Windows)
    ****************************************************************
    PROBLEM SUMMARY:
    WebSphere MQ's response to the error condition was correctly to
    write FDC records to aid problem determination. However, this
    became a secondary problem because of the large quantity of
    information being written to /var/mqm/errors.  It is still
    correct to write FDC records, but the quantity should be
    reduced.
    

Problem conclusion

  • A safety mechanism has been added to prevent this error being
    written too many times. An FDC record will only be written once
    per hour, at maximum.
    ---------------------------------------------------------------
    The fix is targeted for delivery in the following PTFs:
    
                       v7.0
    Platform           Fix Pack 7.0.1.10
    --------           --------------------
    Windows            7.0.1.10
    AIX                7.0.1.10
    HP-UX (PA-RISC)    7.0.1.10
    HP-UX (Itanium)    7.0.1.10
    Solaris (SPARC)    7.0.1.10
    Solaris (x86-64)   7.0.1.10
    iSeries            7.0.1.10
    Linux (x86)        7.0.1.10
    Linux (x86-64)     7.0.1.10
    Linux (zSeries)    7.0.1.10
    Linux (Power)      7.0.1.10
    
                       v7.1
    Platform           Fix Pack 7.1.0.2
    --------           --------------------
    Windows            7.1.0.2
    AIX                7.1.0.2
    HP-UX (Itanium)    7.1.0.2
    Solaris (SPARC)    7.1.0.2
    Solaris (x86-64)   7.1.0.2
    iSeries            7.1.0.2
    Linux (x86)        7.1.0.2
    Linux (x86-64)     7.1.0.2
    Linux (zSeries)    7.1.0.2
    Linux (Power)      7.1.0.2
    
    Platform           v7.5
    --------           --------------------
    Multiplatforms     7.5.0.1
    
    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

    IV15312

  • Reported component name

    WMQ AIX V7

  • Reported component ID

    5724H7221

  • Reported release

    701

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2012-02-08

  • Closed date

    2012-06-29

  • Last modified date

    2012-06-29

  • 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 AIX V7

  • Fixed component ID

    5724H7221

Applicable component levels

  • R701 PSY

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Document Information

Modified date:
29 June 2012