IBM Support

IT43630: VERSION 8.1.X API FUNCTION DSMUPDATEFS() PERFORMANCE IS DEGRADEDCOMPARED TO PREVIOUS API VERSIONS

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APAR status

  • Closed as Permanent restriction.

Error description

  • The dsmUpdateFS() function in IBM Spectrum Protect
    Backup-Archive API version 8.1.x runs longer than it did in
    previous API versions. Although the increased run time might
    vary from one system to another, the observed increase is
    approximately 300%.
    
    dsmUpdateFS() normally runs very fast, with sub-second run time.
    However, if the function is called many times over a short time
    interval, and the other API and application function calls have
    very small run times, then cumulative run times for all calls
    to dsmUpdateFS() are noticeable. The performance issue is
    further exacerbated when there is a large number of file spaces
    associated with the node. That is, run-time per call to
    dsmUpdateFS() scales in rough proportion to the number of file
    spaces that belong to the node.
    
    This problem was observed in the IBM Content Collector for SAP,
    which archives objects to the IBM Spectrum Protect Server. After
    the API was upgraded from version 6.4 to version 8.1, archive
    job run time increased by approximately 300%. Instrumentation
    data shows much more time is spent in the "API Misc" category.
    
    IBM Spectrum Protect versions Affected:
    IBM Spectrum Protect Client Version 8.1 and above on all
    supported platforms
    
    
    Additional Keywords:  TS008784003 slow archive API ICCSAP
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * IBM Spectrum Protect backup-archive API 8.1.x on all         *
    * supported platforms                                          *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * see Error description                                        *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    

Problem conclusion

  • This problem was observed in the IBM Content Collector for SAP,
    which archives objects to the IBM Spectrum Protect Server. After
    the API was upgraded from version 6.4 to version 8.1, archive
    job run time increased. In general the problem can be seen by
    any software that calls the DSMUPDATEFS() API function.
    In newer IBM Content Collector for SAP levels the DSMUPDATEFS()
    API function  is called less frequently and so the concrete
    issue is bypassed.
    

Temporary fix

Comments

APAR Information

  • APAR number

    IT43630

  • Reported component name

    TSM CLIENT

  • Reported component ID

    5698ISMCL

  • Reported release

    81L

  • Status

    CLOSED PRS

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2023-04-25

  • Closed date

    2023-11-02

  • Last modified date

    2023-11-02

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

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

Fix information

Applicable component levels

[{"Business Unit":{"code":"BU029","label":"Software"},"Product":{"code":"SSGSG7","label":"Tivoli Storage Manager"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"81L"}]

Document Information

Modified date:
02 November 2023