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IV69116: AIX CAN CRASH IBM POWER8 E880 (9119-MHE) WITH > THAN 128 CORES APPLIES TO AIX 7100-03

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

  • AIX can crash when running on High End P8 model E880 (9119-MHE)
    Only LPARs running AIX 7.1 TL3 SP3 and later, in native P8
    mode, are exposed.
    Any such LPAR running on a system with more than 128 total
    cores is exposed, which is possible only with the the above P8
    models configured with 3 or more drawers of the 48 core node,
    or 4 drawers of the 32 core node.
    .
    This problem is resolved in SP5.  For SP3 and SP4, ifixes are
    available here:
    ftp://aix.software.ibm.com/aix/ifixes/IV69116/
    https://aix.software.ibm.com/aix/ifixes/IV69116/
    The ifix is concurrent update capable, but will require
    temporarily disabling CPU folding.  You can disable folding and
    install as a hotpatch with:
    > schedo -o vpm_fold_policy=0
    > emgr -i <ifix.epkg.Z> -C
    > schedo -o vpm_fold_policy=(previous setting)
    .
    Customers installing AIX 7.1 TL3 on the above model P8 with
    more than 128 total cores need to set the system to run in P7
    compat mode before attempting installation or the boot for the
    install will fail.  After installation, apply the SP5 or the
    ifix above, and then the system can be set to run in P8 mode.
    

Local fix

Problem summary

  • AIX kernel incorrectly thinks maximum possible processors is
    1024 in some places.  This limit can be surpassed with 3 & 4
    node configurations of E880  systems.
    

Problem conclusion

  • Correct AIX logic to allow for the maximum possible processors.
    

Temporary fix

Comments

  • 6100-08 - use AIX APAR IV70108
    6100-09 - use AIX APAR IV69078
    7100-02 - use AIX APAR IV70228
    7100-03 - use AIX APAR IV69116
    

APAR Information

  • APAR number

    IV69116

  • Reported component name

    AIX V7.1

  • Reported component ID

    5765H4000

  • Reported release

    710

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Submitted date

    2015-02-02

  • Closed date

    2015-02-02

  • Last modified date

    2015-09-30

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

    IV69078

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

Fix information

  • Fixed component name

    AIX V7.1

  • Fixed component ID

    5765H4000

Applicable component levels

  • R710 PSY U865837

       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 #: IV69116

Modified date: 30 September 2015