IC64922: POTENTIAL MEMORY ALLOCATION ISSUE WITH LONG RUNNING GENERATE BACKUPSET COMMAND

APAR status

• Closed as program error.

Error description

• During a long running GENERATE BACKUPSET command (for instance
  if the node has multiple terabytes of data stored), the memory
  consumption of the Tivoli Storage Manager 6.1 server process can
  grow such high, that - dependent on the overall memory available
  on the system - in worst case the complete system gets
  unresponsive.
  The Tivoli Storage Manager server is allocating memory that is
  transaction based and since this particular transaction is kept
  open for the entire GENERATE BACKUPSET process the memory
  continually grows. The amount of memory that is allocated is
  dependent on how many data segments have to be opened to
  generate the backupset. This is obviously exacerbated when the
  objects being generated for the backupset reside in a
  deduplicated storage pool and the node being processed has a lot
  of storage tied to it.
  .
  Customer/L2 Diagnostics:
  To verify you are affected by this APAR you can look at the
  output of the following undocumented service command (issued
  multiple times, for instance each 5 minutes):
  SHOW MEMORY
  .
  If this APAR applies, you will see over time an increasing
  amount/entries memory allocated by asrtrv.c, for instance:
  93532 entries, using   26188960 bytes, from asrtrv.c(2098)
  170027 entries, using   47607560 bytes, from asrtrv.c(2098)
  [...]
  7599267 entries, using 2127794760 bytes, from asrtrv.c(2098)
  7643786 entries, using 2140260080 bytes, from asrtrv.c(2098)
  .
  .
  Tivoli Storage Manager Versions Affected:
  Tivoli Storage Manager 6.1 servers on all supported platforms.
  .
  .
  Initial Impact:
  High
  .
  .
  Additional Keywords:
  zz61 TSM leak mem memory comsum loop hang slow
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All Tivoli Storage Manager server users.     *
  ****************************************************************
  * PROBLEM DESCRIPTION: See ERROR DESCRIPTION.                  *
  ****************************************************************
  * RECOMMENDATION: Apply fixing level when available. This      *
  *                 problem is currently projected to be fixed   *
  *                 in level 6.1.3.2 and 6.1.4.                  *
  *                 Note that this is subject to change at the   *
  *                 discretion of IBM.                           *
  ****************************************************************
  See ERROR DESCRIPTION.
  

Problem conclusion

• The described problem has been resolved.
  

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 SERVER

• Fixed component ID

  5698ISMSV

Applicable component levels

• R61A PSY

     UP

• R61H PSY

     UP

• R61L PSY

     UP

• R61S PSY

     UP

• R61W PSY

     UP