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PI56221: HASH COLLISION FINDS INCORRECT VOB IN INTERNAL MOUNT TABLE LEADING TO EACCESS AND ESTALE ERRORS

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You can track all active APARs for this component.

 

APAR status

  • Closed as program error.

Error description

  • In the IBM Rational ClearCase VOB filehandle there is a hash of
    the superblock pointer, which is used internally within the
    ClearCase mount table. When these two superblocks are hashed to
    the same value ClearCase will always choose the oldest mount
    first. This leads to EACCESS and ESTALE errors trying to access
    file elements witin the VOB mounted at a later time.
    
    WORKAROUND:
    None.
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * Users of IBM Rational ClearCase on systems which export      *
    * view-VOB combinations for non-ClearCase access.              *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * In some cases IBM Rational ClearCase users would find that   *
    * they could not access views and VOBs exported using          *
    * non-ClearCase access and would receive STALE NFS FILE HANDLE *
    * errors.                                                      *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    

Problem conclusion

  • A correction was made in ClearCase versions 8.0.0.18, 8.0.1.11,
    and 9.0.0.1 to eliminate the stale file handle errors for
    exported VOBs.
    

Temporary fix

Comments

APAR Information

  • APAR number

    PI56221

  • Reported component name

    CC&CC MSITE WIN

  • Reported component ID

    5724G3300

  • Reported release

    801

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2016-01-28

  • Closed date

    2016-05-31

  • Last modified date

    2016-05-31

  • 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

    CC&CC MSITE WIN

  • Fixed component ID

    5724G3300

Applicable component levels

  • R800 PSY

       UP

  • R801 PSY

       UP

  • R900 PSY

       UP

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Document Information

Modified date:
31 May 2016