PH03537: CLEARCASE DATABASE PERFORMANCE ON WINDOWS IS DISPROPORTIONATELY IMPACTED BY LOCK CONTENTION ON VISTA FILES.

Rational ClearCase Fix Pack 6 (9.0.1.6) for 9.0.1
Rational ClearCase Fix Pack 7 (9.0.1.7) for 9.0.1
Rational ClearCase Fix Pack 8 (9.0.1.8) for 9.0.1
Rational ClearCase Fix Pack 9 (9.0.1.9) for 9.0.1
Rational ClearCase Fix Pack 10 (9.0.1.10) for 9.0.1
Rational ClearCase Fix Pack 11 (9.0.1.11) for 9.0.1

APAR status

• Closed as program error.

Error description

• Under high transaction loads, Windows ClearCase servers are
  disproportionately impacted by file lock contention on vista.*
  files. The underlying cause is that the OS file lock API used by
  the database core has a fixed one-second retry interval. As
  such, any contended locks will introduce an immediate one-second
  delay in the operations in question.
  
  This issue is more prevalent when the VOB storage is on a
  Network Attached Storage device.
  
  Moving the retry logic into the application, where the retry
  intervals can be tuned resolves this issue.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * Users of Windows ClearCase servers.                          *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * Under high transaction loads, Windows ClearCase servers are  *
  * disproportionately impacted by file lock contention on       *
  * vista.* files. The underlying cause is that the OS file lock *
  * API used by the database core has a fixed one-second retry   *
  * interval. As such, any contended locks will introduce an     *
  * immediate one-second delay in the operations in question.    *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  

Problem conclusion

• A fix is available in ClearCase version 9.0.1.6
  

Temporary fix

Comments

APAR Information

• 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

• R901 PSY

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