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IV54412: RPV_EXPRESS_IO_OP NOT SET FOR SOME LARGE LVM METADATA I/OS APPLIES TO AIX 6100-09

A fix is available

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APAR status

  • Closed as program error.

Error description

  • When using async GLVM, LVM metadata writes are given
    priority to write before the normal async writes, using
    a flag RPV_EXPRESS_IO_OP.
    
    In the case of large LVM metadata writes (which is
    common),
    this flag is not getting set, and LVM metadata writes are
    not given priority.
    
    Being held up behind async writes could potentially mean
    LVM config operations during heavy async glvm i/o take
    a long time, or GLVM I/O timeouts being seen for these
    metadata writes.
    

Local fix

Problem summary

  • When using async GLVM, LVM metadata writes are given
    priority to write before the normal async writes, using
    a flag RPV_EXPRESS_IO_OP.
    
    In the case of large LVM metadata writes (which is
    common),
    this flag is not getting set, and LVM metadata writes are
    not given priority.
    
    Being held up behind async writes could potentially mean
    LVM config operations during heavy async glvm i/o take
    a long time, or GLVM I/O timeouts being seen for these
    metadata writes.
    

Problem conclusion

  • Correct code to properly set the EXPRESS_IO flag for LVM
    metadata writes in async glvm vgs, in all paths.
    

Temporary fix

Comments

  • 6100-07 - use AIX APAR IV54699
    6100-08 - use AIX APAR IV58045
    6100-09 - use AIX APAR IV54412
    6100-09 - use AIX APAR IV54412
    6100-09 - use AIX APAR IV54412
    7100-01 - use AIX APAR IV57689
    7100-02 - use AIX APAR IV53947
    7100-03 - use AIX APAR IV54434
    7100-04 - use AIX APAR IV54542
    

APAR Information

  • APAR number

    IV54412

  • Reported component name

    AIX 610 STD EDI

  • Reported component ID

    5765G6200

  • Reported release

    610

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Submitted date

    2014-01-22

  • Closed date

    2014-01-22

  • Last modified date

    2016-05-10

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

    IV53947

  • 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 U859282

       UP14/05/21 I 1000

PTF to Fileset Mapping



Document information

More support for: AIX Standard Edition

Software version: 610

Operating system(s): AIX

Reference #: IV54412

Modified date: 10 May 2016