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IZ96554: BAD PAGES REPORTED BY DB2

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APAR status

  • Closed as program error.

Error description

  • A previous change was made to allow small synchronous
    writes
    to be sent to disk using the original IO size, as opposed
    to expanding
    them to full block writes.  When such a write was being
    processed in
    writeBuffer, the code was incorrectly bypassing clearing
    the phantom
    bit when writing to a pre-allocated block.  On a
    subsequent read, the code
    would see the phantom bit and return a block full of
    zeroes to the caller,
    i.e. the previous write was essentially lost.
    

Local fix

Problem summary

  • A change was made to allow small synchronous writes
    to be sent to disk using the original IO size, as
    opposed to expanding them to full block writes.
    When such a write was being processed in writeBuffer,
    the code was incorrectly bypassing clearing the
    phantom bit when writing to a pre-allocated block.
    On a subsequent read, the code would see the phantom
    bit and return a block full of zeroes to the caller,
    i.e. the previous write was essentially lost.
    

Problem conclusion

  • The fix was not do a range write when dealing with
    a preallocated block.
    

Temporary fix

Comments

APAR Information

  • APAR number

    IZ96554

  • Reported component name

    GPFS/AIX5L V3

  • Reported component ID

    5765G66AP

  • Reported release

    340

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Submitted date

    2011-03-11

  • Closed date

    2011-03-11

  • Last modified date

    2015-05-14

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

    IZ96553

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

Fix information

  • Fixed component name

    GPFS/AIX5L V3

  • Fixed component ID

    5765G66AP

Applicable component levels

  • R340 PSY U869511

       15/05/14 I 1000

PTF to Fileset Mapping

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Document Information

Modified date:
19 August 2022