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PM63090: Need to set TCP_NODELAY socket option in multitool and db_server

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You can track all active APARs for this component.

 

APAR status

  • Closed as program error.

Error description

  • TCP ACK delays in multisite syncreplica export results in long
    lock held times.
    

Local fix

Problem summary

  • this is to fix a TCP buffer read poll wait issue for multitool
    syncreplica -export process by setting up TCP NO_DELAY option.
    It  is noticed that while talking to DB server,  multitool
    process somehow repeatedly wait for about 40ms to read from TCP
    buffer after several reads.  To suppress this option setting,
    set up an environment variable  CLEARCASE_SUPPRESS_NODELAY
    before running multitool command.
    

Problem conclusion

  • A fix is available in ClearCase versions 7.1.2.7 and 8.0.0.3
    

Temporary fix

Comments

APAR Information

  • APAR number

    PM63090

  • Reported component name

    CLEARCASE WIN

  • Reported component ID

    5724G2900

  • Reported release

    712

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2012-04-23

  • Closed date

    2012-06-27

  • Last modified date

    2012-06-27

  • 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

  • R712 PSY

       UP

  • R800 PSY

       UP

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Document Information

Modified date:
27 June 2012