IBM Support

PH34446: CLEARCASE USERS ON RED HAT 7.X MAY SEE INTERMITTENT DELAYS IN THE EXECUTION OF SOME COMMANDS IN A DYNAMIC VIEW

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APAR status

  • Closed as program error.

Error description

  • When working in a IBM Rational ClearCase dynamic view on Red Hat
    7.x, some operations may be subject to delays of seconds or even
    hours.  The problem is typically noticed on commands that use a
    readdir system call to enumerate directory contents inside a
    ClearCase view, such as a cp or ls command.  When the slowdown
    (apparent "hang") occurs, the kernel stack (cat
    /proc/<pid>/stack) may show the process waiting in the kernel
    RPC code for a memory allocation call to return.
    
    WORKAROUND:
    Modifying the kernel tuning parameters vfs_cache_pressure and
    min_free_kbytes may reduce occurrences of this problem.
    
    Please contact ClearCase customer support for further
    information.
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * Users of ClearCase dynamic views on Red Hat Linux 7.         *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * When working in a dynamic view on Red Hat 7.x, a problem     *
    * allocating buffer space for kernel RPC data can cause delays *
    * of seconds to hours to occur during some ClearCase           *
    * operations.                                                  *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    

Problem conclusion

  • This problem is fixed in ClearCase 9.0.1.12, 9.0.2.4, and
    9.1.0.1.
    

Temporary fix

Comments

APAR Information

  • APAR number

    PH34446

  • 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

    2021-02-12

  • Closed date

    2021-06-29

  • Last modified date

    2021-06-29

  • 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

[{"Line of Business":{"code":"LOB45","label":"Automation"},"Business Unit":{"code":"BU029","label":"Software"},"Product":{"code":"SSSH27","label":"Rational ClearCase"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"901"}]

Document Information

Modified date:
30 June 2021