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IV69786: POSSIBLE DISK I/O HANG ON ADAPTER FIRMWARE ISSUE.

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

  • Some old levels of FC adapter firmware had an issue where
    the adapter would erroneously return an error continuously.
    Normally, that would result in an I/O failure.  However, there
    is one case where it could cause the PCM to indefinitely
    retry reading information from the LUN, causing an I/O hang
    instead of an I/O failure.
    

Local fix

Problem summary

  • Some old levels of FC adapter firmware had an issue where
    the adapter would erroneously return an error continuously.
    Normally, that would result in an I/O failure.  However, there
    is one case where it could cause the PCM to indefinitely
    retry reading information from the LUN, causing an I/O hang
    instead of an I/O failure.
    

Problem conclusion

  • Modified the PCM to check for excessive retries when rereading
    the LUN access state information.
    

Temporary fix

Comments

APAR Information

  • APAR number

    IV69786

  • Reported component name

    AIX V7.1

  • Reported component ID

    5765H4000

  • Reported release

    710

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Submitted date

    2015-02-23

  • Closed date

    2015-02-23

  • Last modified date

    2015-11-22

Fix information

  • Fixed component name

    AIX V7.1

  • Fixed component ID

    5765H4000

Applicable component levels

  • R710 PSY U861536

       UP15/11/22 I 1000

PTF to Fileset Mapping



Document information

More support for: AIX Enterprise Edition

Software version: 710

Operating system(s): AIX

Reference #: IV69786

Modified date: 22 November 2015