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IV69309: MPIO PATH RECOVERS TOO SOON WHEN A LUN IS UNMAPPED APPLIES TO AIX 7100-03

A fix is available

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APAR status

  • Closed as program error.

Error description

  • If there are multiple adapters in use to provide paths to an
    hdisk, and the hdisk is opened while the LUN is unmapped from
    one of those adapters (thus returning 05/2500 SCSI sense),
    then the AIX MPIO code may recover the path too quickly after
    the open.  This could lead to the PCM selecting that unusable
    path, and possibly having the path fail and recover repeatedly.
    

Local fix

Problem summary

  • If there are multiple adapters in use to provide paths to an
    hdisk, and the hdisk is opened while the LUN is unmapped from
    one of those adapters (thus returning 05/2500 SCSI sense),
    then the AIX MPIO code may recover the path too quickly after
    the open.  This could lead to the PCM selecting that unusable
    path, and possibly having the path fail and recover repeatedly.
    

Problem conclusion

  • Modified SCSI disk driver to properly report status of a path
    open when the storage device returns 05/2500 sense data to
    the Test Unit Ready command.
    

Temporary fix

Comments

  • 6100-08 - use AIX APAR IV70106
    6100-09 - use AIX APAR IV69311
    7100-02 - use AIX APAR IV70317
    7100-03 - use AIX APAR IV69309
    

APAR Information

  • APAR number

    IV69309

  • Reported component name

    AIX V7.1

  • Reported component ID

    5765H4000

  • Reported release

    710

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Submitted date

    2015-02-09

  • Closed date

    2015-02-09

  • Last modified date

    2015-09-30

Fix information

  • Fixed component name

    AIX V7.1

  • Fixed component ID

    5765H4000

Applicable component levels

  • R710 PSY U865814

       UP15/05/19 I 1000

PTF to Fileset Mapping



Document information

More support for: AIX Enterprise Edition

Software version: 710

Operating system(s): AIX

Reference #: IV69309

Modified date: 30 September 2015