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IC96021: TIVOLI STORAGE MANAGER SNAPDIFF SNAPSHOT(S) CAN REMAIN IF THE INCREMENTAL SNAPDIFF BACKUP IS CANCELLED

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APAR status

  • Closed as program error.

Error description

  • There should never be more than one Tivoli Storage Manager
    snapdiff created snapshot.
    If the entire snapdiff backup fails, two snapshots are
    left on the volume - the base snapshot which is registered on
    the server
    and the diff snapshot that the backup which failed created.
    
    The next backup should use the same registered base snapshot,
    create a new diff snapshot, and, assuming the backup completes,
    delete the old base and register the current diff on the server
    to be the base in the next backup.
    
    What happens is that the diff snapshot created by the backup
    which failed didn't get deleted. Since it isn't registered as
    the new base
    it will never be used by a future backup and therefore will
    never be deleted.
    
    
    This can be recreated by following steps;
    
    Run an INCREMENTAL -SNAPDIFF command a few times from the dsmc,
    and cancel the backup in the middle with CTRL+C.
    
    The backup will stop, and the snapshot created during each
    backup will
    remain on the NetApp.
    
    similarly, when the backup terminates due to a severe error
    (client returns 12),
    the issue occurs.
    
    
    Tivoli Storage Manager Versions Affected:
    Tivoli Storage Manager Client versions 6.1, 6.2, 6.3 and 6.4 on
    AIX, Linux and Windows
    
    Initial Impact:
    Medium
    
    Additional Keywords:
    TSM zz61 zz62 zz63 zz64  snapdiff snapshot delete netapp
    

Local fix

  • Delete all snapshots newer than the oldest Tivoli Storage
    Manager created snapshot. That would guarantee that the
    remaining
    Tivoli Storage Manager snapshot would be used as the base in the
    next snapdiff backup regardless of whether or not it is
    registered as the base.
    
    If the registered base doesn't exist (was deleted), the most
    recent snapshot older than the registered base will be selected
    as the base for the backup.
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED: Version 6.1.0 - 7.1.0 backup-archive clients *
    *                 running on Microsoft Windows, AIX and Linux. *
    *                                                              *
    ****************************************************************
    * PROBLEM DESCRIPTION: See ERROR DESCRIPTION                   *
    ****************************************************************
    * RECOMMENDATION: Apply fixing level when available. This      *
    *                 problem is currently projected to be fixed   *
    *                 in levels 6.4.2 and 7.1.1. Note that this is *
    *                 subject to change at the discretion of IBM.  *
    ****************************************************************
    *
    

Problem conclusion

  • After installing the fixing code the client will remove all
    snapshots created by TSM except the one which is currently
    registered on the TSM server as the base snapshot.
    

Temporary fix

Comments

APAR Information

  • APAR number

    IC96021

  • Reported component name

    TSM CLIENT

  • Reported component ID

    5698ISMCL

  • Reported release

    64W

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2013-09-17

  • Closed date

    2013-11-11

  • Last modified date

    2013-11-11

  • APAR is sysrouted FROM one or more of the following:

  • APAR is sysrouted TO one or more of the following:

Modules/Macros

  • DSMC
    

Fix information

  • Fixed component name

    TSM CLIENT

  • Fixed component ID

    5698ISMCL

Applicable component levels

  • R64A PSY

       UP

  • R64L PSY

       UP

  • R64W PSY

       UP



Document information

More support for: Tivoli Storage Manager

Software version: 64W

Reference #: IC96021

Modified date: 11 November 2013