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IZ77185: AFTER ASCQ 9401 UNABLE TO FAILOVER TO ALTERNATE PATH APPLIES TO AIX 6100-05

A fix is available

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You can track all active APARs for this component.

 

APAR status

  • Closed as program error.

Error description

  • DS5k Controller reset (or concurrent FW upgrade) causes
    expected SC_DISK_PCM_ERR4 errors with ASCQ 9401 (means
    LUN
    not owned). However for all new IOs we still use the
    wrong
    path and log tons of 9401 errors even for more than 30
    min.
    or until reboot. We simply don't failover to alternate
    path.
    

Local fix

Problem summary

  • When running CCDL htx will return with ENODEV when the FO is
    attempted.
    

Problem conclusion

  • If a disk is partially opened and it attempts to do a FO, the
    FO will fail. It then marks the hdisk as failing the FO and it
    sets the FO flags so that some other hdisk can do the FO. The
    hdisk that is partially opened should not attempt a FO. That
    hdisk does not know what state the controllers are in. In the
    FO code, check to see if the disk is partially opened. If it
    then just stop the FO.
    

Temporary fix

Comments

APAR Information

  • APAR number

    IZ77185

  • Reported component name

    AIX 610 STD EDI

  • Reported component ID

    5765G6200

  • Reported release

    610

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Submitted date

    2010-06-08

  • Closed date

    2010-06-16

  • Last modified date

    2013-03-28

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

    IZ76386

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

    U838377

Fix information

  • Fixed component name

    AIX 610 STD EDI

  • Fixed component ID

    5765G6200

Applicable component levels

  • R610 PSY U838377

       UP10/08/20 I 1000

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Document Information

Modified date:
17 December 2021