PK62160: TSM SERVER PERFORMANCE DEGRADATION RUNNING QUERY NODEDATA

APAR status

• Closed as program error.

Error description

• Running QUERY NODEDATA against a stgpool that has a very large
  number of volumes can give the appearance of a looping server.
  The issue involves internal lists that are built while scanning
  for storage pool volumes to be checked for occupancy. As the
  allocated list is exceeded it is expanded by a static amount and
  all data is copied to the new list. Since the majority of this
  processing is in memory, high cpu usage will be seen and it will
  run virtually uninterrupted. Storage pools with a very large
  number of volumes (10,000+) could run for 30 minutes or longer.
  

Local fix

• Utilize additional parameters on the QUERY NODEDATA command to
  reduce the list size, such as STGPOOL and VOLUME. Wildcards can
  be used to select a subset of the volumes. Other queries that
  scan storage pool volumes may also experience this behavior and
  should also incorporate limiting parameters.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All TSM server users.                        *
  ****************************************************************
  * PROBLEM DESCRIPTION: See ERROR DESCRIPTION.                  *
  ****************************************************************
  * RECOMMENDATION: Apply fixing level when available.           *
  *                 This problem is currently projected to be    *
  *                 fixed in levels 5.4.5 and 5.5.2.             *
  *                 Note that this is subject to change at       *
  *                 the discretion of IBM.                       *
  ****************************************************************
  *
  

Problem conclusion

• The TSM server has been corrected.
  

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:

  IC57160

Fix information

• Fixed component name

  TSM FOR OS/390

• Fixed component ID

  5698ISMVS

Applicable component levels

• R540 PSY UK45052

     UP09/03/24 P F903

• R552 PSY

     UP

Fix is available

• Select the PTF appropriate for your component level. You will be required to sign in. Distribution on physical media is not available in all countries.