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IT05734: DATA PROTECTION FOR HYPER-V INCREMENTAL FOREVER BACKUPS MIGHT BE CORRUPTED

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You can track all active APARs for this component.

APAR status

  • Closed as program error.

Error description

  • Incremental forever backups of Microsoft Hyper-V virtual
    machines might be corrupted. The problem is due to a logic error
    in the Tivoli Storage Manager backup-archive client (data mover)
    code that identifies changed sectors. No error messages are
    logged during affected backup operations. However the affected
    backup data is incomplete and thus corrupted. Restore operations
    for the corrupted backup data are also reported as successful.
    No error messages are logged.
    
    The problem is not detectable until the restored data is
    accessed, either from a fully restored system or from a snapshot
    mounted by the Recovery Agent. Possible symptoms include:
    
    * One or more files might not contain the expected content
    * Operating system messages indicate file system corruption
    * Other erratic operating system or application behavior
    
    Portions of the corrupted Hyper-V backups might be recoverable.
    For example, it might be possible to use the Recovery Agent to
    recover certain needed files provided that those files were not
    affected by the incorrect backup data. It is not possible to
    determine in advance whether a given file in a Hyper-V virtual
    machine backup is affected.
    
    Note: The external symptoms are similar to those of APAR
    IT04831. However this APAR (IT05734) has a different root cause.
    
    Affected product versions: Tivoli Storage Manager for Virtual
    Environments: Data Protection for Microsoft Hyper-V 7.1.1 when
    using Tivoli Storage Manager Backup-Archive Client version
    7.1.1.0 or 7.1.1.1 as the data mover.
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED: IBM Tivoli Storage Manager for Virtual       *
    *                 Environments: Data Protection for            *
    *                 Microsoft Hyper-V versions 7.1.1 on          *
    *                 platforms Windows 2012, Windows 2012 R2      *
    ****************************************************************
    * PROBLEM DESCRIPTION: See ERROR DESCRIPTION                   *
    ****************************************************************
    * RECOMMENDATION: This issue is projected to be fixed in the   *
    *                 Tivoli Storage Manager Client on Windows     *
    *                 7.1.2                                        *
    *                                                              *
    *                 Note 1: The Tivoli Storage Manager (TSM)     *
    *                 Client is a prerequisite to using the Data   *
    *                 Protection for Microsoft Hyper-V.            *
    *                 In Data Protection for Microsoft Hyper-V     *
    *                 environments, the TSM Client is also known   *
    *                 as the data mover.                           *
    *                                                              *
    *                 Note 2: This is subject to change at the     *
    *                 discretion of IBM.                           *
    ****************************************************************
    *
    

Problem conclusion

  • The data loss problem that occurs within Hyper-V incremental
    forever backups was fixed.
    

Temporary fix

  • Tivoli Storage Manager Client on Windows 7.1.1.2
    
    Note: Until a Data Protection for Microsoft Hyper-V packaged
    fix of a fixing TSM Client level is available,
    Data Protection for Microsoft Hyper-V customers can install
    and use a fixed level of the the TSM Client in their
    environment.
    

Comments

APAR Information

  • APAR number

    IT05734

  • Reported component name

    TSM CLIENT

  • Reported component ID

    5698ISMCL

  • Reported release

    71W

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2014-11-21

  • Closed date

    2014-12-11

  • Last modified date

    2015-11-06

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

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

    IT05780

Modules/Macros

  • DSMAGENT
    

Fix information

  • Fixed component name

    TSM CLIENT

  • Fixed component ID

    5698ISMCL

Applicable component levels

  • R71W PSY

       UP



Document information

More support for: Tivoli Storage Manager

Software version: 71W

Reference #: IT05734

Modified date: 06 November 2015