IBM Support

PH23440: CLEARCASE INFORMATION CENTER INCORRECTLY STATES THAT MVFS SCALING FACTOR IS AUTOMATICALLY SET FOR ALL PLATFORMS

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APAR status

  • Closed as program error.

Error description

  • The "Adjusting the MVFS scaling factor" page at
    https://www.ibm.com/support/knowledgecenter/SSSH27_9.0.1/com.ibm
    .rational.clearcase.cc_admin.doc/topics/t_perf_clnt_scale_factor
    .htm incorrectly states:
    
    "The default MVFS scaling factor is automatically set based on
    the available physical memory installed on the host."
    
    This statement is incorrect. A more correct statement would be:
    "For Unix/Linux hosts, the default MVFS scaling factor is
    automatically set based on the available physical memory
    installed on the host. For Windows host, the scaling factor is
    set at the time of installation and does not change unless
    manually adjusted."
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * Users of ClearCase dynamic views on Microsoft Windows        *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * As stated in the ClearCase documentation, the default MVFS   *
    * scaling factor is automatically set based on the available   *
    * physical memory installed on the host. On Microsoft Windows, *
    * two distinct problems were inhibiting this heuristic         *
    * algorithm from functioning properly.  The allowable values   *
    * for this tunable parameter are 0-5.  An error in the         *
    * calculation was causing this range to be truncated to 0-2.   *
    * There was also a defect in the ClearCase Control Panel       *
    * application which prevented the actual value that is in use  *
    * from being displayed, unless the default had been explicitly *
    * overridden when installing ClearCase.  Unless it was changed *
    * during the installation, the Control Panel always showed 1   *
    * as the scaling factor value.                                 *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    

Problem conclusion

  • These problems are fixed in ClearCase 9.0.1.10 and 9.0.2.2.   If
    the default value is not overridden during installation, the
    MVFS scaling factor on a Windows system will be correctly
    calculated in the range 0-5, and the ClearCase Control Panel
    application will correctly display the calculated value.
    

Temporary fix

Comments

APAR Information

  • APAR number

    PH23440

  • Reported component name

    CLEARCASE WIN

  • Reported component ID

    5724G2900

  • Reported release

    901

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2020-03-18

  • Closed date

    2020-06-29

  • Last modified date

    2020-06-29

  • 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

    CLEARCASE WIN

  • Fixed component ID

    5724G2900

Applicable component levels

[{"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Product":{"code":"SSSH27","label":"Rational ClearCase"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"901","Line of Business":{"code":"LOB36","label":"IBM Automation"}}]

Document Information

Modified date:
30 June 2020