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IT06826: MIGRATION FROM DISK STORAGE POOL STORING DATA FROM NODES WITH "SPLITLARGEOBJECTS" BEING ENABLED SEEMS TO HANG

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APAR status

  • Closed as program error.

Error description

  • A migration from a disk storage pool storing data from nodes
    with  "SPLITLARGEObjects" being enabled may look to be hung
    though it is actually looping.
    In the next storage pool a volume is mounted by the migration
    process but no data appears to be moving for hours.
    A internal trace reveals that the same cluster is selected in a
    loop and trace line "[BfAddSAToCopyControl]:Exit, rc 4208"
    appears repeatedly.
    This only happens if the disk storage pool holds split large
    objects.
    
    Tivoli Storage Manager Versions Affected: All platforms with
    release 7.1
    
    Customer/L2 Diagnostics:
    
    A trace with flags AF, BF , DF  shows that the following events
    repeats over and over again for a few "objids" :
    
    [dfmigr.c][6057][ReserveCluster]:Evaluating cluster
    (ck1=317,ck2=6) with inUse=0, procMigDelay=0, and migContMode=0.
    [dfmigr.c][6130][ReserveCluster]:Process 5833 reserving cluster
    srvId=0, ck1=317, ck2=6 for migration from pool DISKPOOL(20)
    with retryCount 20.
    [dfmigr.c][3170][MigrateCluster]:Process 5833 migrating cluster
    srvId=0, ck1=317 ck2=6for pool DISKPOOL(20).
    [dfmove.c][2434][DfGetSuperAggregateBitfiles]:Entering for
    fragment 645783536
    [bfcputil.c][4892][BfAddSAToCopyControl]:Entering for objId
    645783536
    [bfcputil.c][4945][BfAddSAToCopyControl]:There are 2 entries in
    the saList
    [bfcputil.c][5129][BfAddSAToCopyControl]:Exit, rc 4208
    [dfmove.c][2452][DfGetSuperAggregateBitfiles]:rc from
    BfAddSAToCC is 4208
    [dfmove.c][2568][DfGetSuperAggregateBitfiles]:Exiting for
    fragment 645783536, rc 4208
    
    
    
    Initial Impact: Medium
    
    Additional Keywords:  TSM FRAGMENT STUCK PERFORMANCE WAIT HANG
                          LOOP
    

Local fix

  • . Cancel the looping process and let it start again. Most of the
     time the problem disappears at the next run.
    
    To prevent the problem for future migrations:
    . Disable "splitlargeobjects" option for all the nodes that
    store data in the affected disk storage pool:
        UPDATE NODE <nodename>  SPLITLARGEOBJECTS=NO
    

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 levels 7.1.1.200 and 7.1.3. Note    *
    * that this is subject to change at the discretion of IBM.     *
    ****************************************************************
    

Problem conclusion

  • This problem was fixed.
    Affected platforms:  AIX, HP-UX, Solaris, Linux, and Windows.
    

Temporary fix

Comments

APAR Information

  • APAR number

    IT06826

  • Reported component name

    TSM SERVER

  • Reported component ID

    5698ISMSV

  • Reported release

    71W

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2015-01-29

  • Closed date

    2015-03-04

  • Last modified date

    2015-03-30

  • 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

  • R71A PSY

       UP

  • R71H PSY

       UP

  • R71L PSY

       UP

  • R71S PSY

       UP

  • R71W PSY

       UP



Document information

More support for: Tivoli Storage Manager

Software version: 7.1.3

Reference #: IT06826

Modified date: 30 March 2015