PK84259: INTENSIVE SESSION OPEN-CLOSE ACTIVITY CAUSES SESSION DELAY OR EVEN REFUSAL - ANR0429W SESSION ... FOR NODE ...REFUSED

IBM Tivoli Storage Manager V6.1 Fix Pack 4 (6.1.4) Server Downloads

APAR status

• Closed as program error.

Error description

• Per design certain application clients open and close a large
  number of StorageAgent/Server sessions at very high speed.
  This behaviour is typical during "crosscheck" or
  "delete obsolete" by Oracle RMAN via TDP Oracle, where a large
  number of objects may be queried from the TSM database, one
  session for each object query.
  .
  An inefficiency has been identified in session queue processing
  that can lead to different degrees of slowdown:
  From an increased duration of crosscheck/delete obsolete
  up to the following message in actlog:
  .
  ANR0429W Session ... for node ... refused
  - maximum server sessions ... exceeded.
  .
  Any other client may experience the same problem if it opens
  and closes large numbers of sessions at high speed.
  .
  TSM Versions Affected:
  TSM Server and StorageAgent 5.5 on all platforms
  .
  Initial Impact: Medium
  

Local fix

• Switching LanFree clients to "enablelanfree no" during
  crosscheck/delete obsolete may increase processing speed
  through bypassing the session bottleneck on the StorageAgent.
  .
  Increasing MAXSESSIONS does not necessarily help.
  .
  Experience on the reported z/OS system suggests that tracing
  the TSM server with
  "trace enable session addmsg admcmd" and
  "trace begin filespec MAXSIZE=300"
  changes the timing behaviour, so ANR0429W can be prevented at
  the expenses of a reduced general TSM Server performance.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All Tivoli Storage Manager server users on   *
  *                 all platforms.                               *
  ****************************************************************
  * PROBLEM DESCRIPTION: See error description.                  *
  ****************************************************************
  * RECOMMENDATION: Apply fixing level when available. This      *
  *                 problem is currently projected to be fixed   *
  *                 in levels 5.4.6, 5.5.3, and 6.1.3. Note      *
  *                 that this is subject to change at the        *
  *                 discretion of IBM.                           *
  ****************************************************************
  *
  

Problem conclusion

• This problem was fixed.
  

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

  TSM FOR OS/390

• Fixed component ID

  5698ISMVS

Applicable component levels

• R550 PSY

     UP