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IZ77189: OPERATION TO CHANGE THE PREFERRED PATH FOR A LUN HANGS APPLIES TO AIX 6100-05

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APAR status

  • Closed as program error.

Error description

  • The operation to change the preferred path
    of a LUN can hang.  Customer could experience
    a similar hang during LPAR migration, where
    that operation will try to switch the
    preferred paths.
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:
    * Users of MPIO storage running the 6100-05 Technology Level
    * with the devices.common.IBM.mpio.rte fileset at the 6.1.5.0
    * or 6.1.5.1 level.
    ****************************************************************
    * PROBLEM DESCRIPTION:
    * An operation to change the preferred path of a LUN could hang.
    * A similar hang could be experienced during LPAR migration
    * where it will try to switch the preferred paths.
    ****************************************************************
    * RECOMMENDATION:
    * Install APAR IZ77189.
    ****************************************************************
    

Problem conclusion

  • While trying to change the preferred path, MODE SENSE
    goes to passive path.  Even after completing the I/O,
    we missed marking the I/O done for the passive path
    causing the hang.
    

Temporary fix

  • *********
    * HIPER *
    *********
    

Comments

APAR Information

  • APAR number

    IZ77189

  • Reported component name

    AIX 610 STD EDI

  • Reported component ID

    5765G6200

  • Reported release

    610

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    YesHIPER

  • Submitted date

    2010-06-08

  • Closed date

    2010-06-08

  • Last modified date

    2013-03-29

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

    IZ76820

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

Fix information

  • Fixed component name

    AIX 610 STD EDI

  • Fixed component ID

    5765G6200

Applicable component levels

  • R610 PSY U834710

       UP10/08/20 I 1000

PTF to Fileset Mapping

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Document Information

Modified date:
29 March 2013