IC63796: ERRORS SEEN DURING MIGRATION FROM CACHING ENABLED DISK POOL TO DEDUP FILE POOL

IBM Tivoli Storage Manager V6.1 Fix Pack 3 (6.1.3) Server Downloads

APAR status

• Closed as program error.

Error description

• When attempting to migrate data from a disk storage pool with
  caching enabled to a FILE storage pool that has been enabled for
  deduplication, the following errors may be seen:
  
     ANR9999D SelectCluster(dfmigr.c:2700) Thread<199485>: Process
     999 detected a discrepancy in the database for cluster
     srvId=0, ck1=99 while migrating from pool DISKPOOL(1).
     ANR9999D Thread<199485> issued message 9999 from:
     ANR9999D Thread<199485> 0x0000000100012440 StdPutText
     ANR9999D Thread<199485> 0x0000000100012cfc OutDiagToCons
     ANR9999D Thread<199485> 0x000000010000e51c outDiagfExt
     ANR9999D Thread<199485> 0x000000010091c974 SelectCluster
     ANR9999D Thread<199485> 0x000000010091bfd4 DfMigrationThread
     ANR9999D Thread<199485> 0x00000001000094a4 StartThread
     ANR1032W Migration process 999 terminated for storage pool
     DISKPOOL - internal server error detected.
     ANR9999D Thread<199485> issued message 1032 from:
     ANR9999D Thread<199485> 0x000000010001175c StdPutMsg
     ANR9999D Thread<199485> 0x00000001000132a4 outRptf
     ANR9999D Thread<199485> 0x000000010091d2bc EndMigration
     ANR9999D Thread<199485> 0x000000010091c1cc DfMigrationThread
     ANR9999D Thread<199485> 0x00000001000094a4 StartThread
  
  These errors occur because the deduplication process is
  erroneously creating/updating cluster information for the cached
  bitfiles in the disk storage pool.  As a result, the migration
  process is attempting to migrate cached bitfiles.  These errors
  do not prevent data from being successfully migrated to the FILE
  storage pool.
  
  Platforms affected:
  All TSM 6.1.x Servers
  
  Customer/L2 Diagnostics:
  A trace (DF flag) of the failing migration process will show
  attempts to migrate an empty cluster, similar to the following:
  
     [dfmigr.c][2791][MigrateCluster]:Process 999 migrating
     cluster srvId=0, ck1=99 for pool DISKPOOL(1).
     [dfutil.c][825][DfLockBfRootTracked]:Acquiring lock (sLock)
     on bitfile root.  Called from dfmigr.c(2870).
     [dfutil.c][865][DfUnlockBfRootTracked]:Releasing lock on
     bitfile root.  Called from dfmigr.c(2881).
     [dfmigr.c][2885][MigrateCluster]:Empty cluster detected
     [dfmigr.c][4971][ReleaseCluster]:Process 999 releasing
     cluster srvId=0, ck1=99 for migration from pool DISKPOOL(1).
  
  Additional Keywords:
  dedup deduplication cache tsm
  

Local fix

• To ensure that all data is successfully migrated, increase the
  number of migration processes available for the disk storage
  pool:
  
     UPDATE STGPOOL <poolname> MIGPR=2
  
  To prevent these migration errors from occurring, either of the
  following actions can be performed:
  
     1. Disable caching for disk storage pool, or
     2. Disable deduplication for FILE storage pool
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All Tivoli Storage Manager server users.     *
  ****************************************************************
  * PROBLEM DESCRIPTION: See ERROR DESCRIPTION.                  *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  This problem was fixed at level 6.1.2.1.
  

Problem conclusion

• See ERROR DESCRIPTION.
  

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