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IT08768: DSMQSAN PROCESS PERFORMANCE ISSUE IN AIX LARGE PAGE ENVIRONMENT SUPPORT

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You can track all active APARs for this component.

APAR status

  • Closed as program error.

Error description

  • Tivoli Storage Manager Server on AIX platform can suffer
    performance problems when executing a SAN discovery operation.
    The dsmqsan process will always run with high CPU utilization.
    
    The problem is present only when the AIX system has been set up
    for the Large Page Environment.
    
    It is also possible (but not necessary) to have the following
    messages present in the activity log:
    
    ANR1926W A SCSI inquiry has timed out after 90 seconds.
    ANR1786W HBAAPI not able to get adapter name.
    
    
    
    Customer/L2 Diagnostics:
    
    A Tivoli Storage Manager Server trace (flags suggested: NA
    NAHBAAPI NAQSANPIPE SPI SPID ADDMSG) will   indicate the SAN
    discovery runs repeatedly in a loop:
    
    17:37:26.244
    [31][nadiscvr.c][2318][NaDiscoverThread]:checkConfig signal
    received. Starting to discover SAN devices
    ...
    17:37:49.649
    [31][nadiscvr.c][2318][NaDiscoverThread]:checkConfig signal
    received. Starting to discover SAN devices
    ...
    17:38:12.721
    [31][nadiscvr.c][2318][NaDiscoverThread]:checkConfig signal
    received. Starting to discover SAN devices
    ...
    17:38:34.362
    [31][nadiscvr.c][2318][NaDiscoverThread]:checkConfig signal
    received. Starting to discover SAN devices
    ...
    17:38:55.776
    [31][nadiscvr.c][2318][NaDiscoverThread]:checkConfig signal
    received. Starting to discover SAN devices
    ...
    17:39:19.205
    [31][nadiscvr.c][2318][NaDiscoverThread]:checkConfig signal
    received. Starting to discover SAN devices
    
    
    Tivoli Storage Manager Versions Affected: All Tivoli Storage
    Manager Server on AIX platforms
    
    Initial Impact: Low
    
    Additional Keywords: Large Page Environment AIX LPE SAN
    Discovery ANR1926W ANR1786W dsmqsan
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * All Tivoli Storage Manager server users of SANdiscovery.     *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * See ERROR DESCRIPTION.                                       *
    ****************************************************************
    * RECOMMENDATION:                                              *
    * Apply fixing levels when available.                          *
    * This problem is currently projected to be fixed in levels    *
    * 6.3.6 and 7.1.3.                                             *
    * Note that this is subject to change at the discretion of     *
    * IBM.                                                         *
    ****************************************************************
    

Problem conclusion

  • This problem was fixed.
    Affected platforms:  AIX, Linux, Solaris.
    

Temporary fix

Comments

APAR Information

  • APAR number

    IT08768

  • Reported component name

    TSM SERVER

  • Reported component ID

    5698ISMSV

  • Reported release

    71A

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2015-05-08

  • Closed date

    2015-07-07

  • Last modified date

    2016-07-28

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

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

Fix information

  • Fixed component name

    TSM SERVER

  • Fixed component ID

    5698ISMSV

Applicable component levels

  • R63A PSY

       UP

  • R71A PSY

       UP



Document information

More support for: Tivoli Storage Manager

Software version: 7.1.3

Reference #: IT08768

Modified date: 28 July 2016