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

IBM Tivoli Storage Manager (TSM) Client 7.1.2 Downloads and READMEs

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 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

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