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

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You can track all active APARs for this component.

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 number

    IC63796

  • Reported component name

    TSM SERVER

  • Reported component ID

    5698ISMSV

  • Reported release

    61A

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2009-10-15

  • Closed date

    2009-11-05

  • Last modified date

    2009-11-05

  • 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



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Document information


More support for:

Tivoli Storage Manager

Software version:

61A

Reference #:

IC63796

Modified date:

2009-11-05

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