IT04831: 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 data blocks. 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 missing backup data. It is not possible to
  determine in advance whether a given file in a Hyper-V virtual
  machine backup is affected.
  
  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 as the data mover.
  

Local fix

• None. Do not perform incremental forever backups of Microsoft
  Hyper-V virtual machines until a fixing Tivoli Storage Manager
  Backup-Archive Client (data mover) version is available. The fix
  is currently targeted for interim fix version 7.1.1.1 at the end
  of October. This information is subject to change at the
  discretion of IBM.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: IBM Tivoli Storage Manager for Virtual       *
  *                 Environments: Data Protection for            *
  *                 Microsoft Hyper-V version 7.1.1.0 using the  *
  *                 Tivoli Storage Manager Backup-Archive        *
  *                 Client (data mover) version 7.1.1.0 on       *
  *                 Microsoft Windows Server 2012 and Microsoft  *
  *                 Windows Server 2012 R2                       *
  ****************************************************************
  * PROBLEM DESCRIPTION: See ERROR DESCRIPTION                   *
  ****************************************************************
  * RECOMMENDATION: Apply the fixing Tivoli Storage Manager      *
  *                 Backup-Archive Client (data mover) level     *
  *                 when available. This problem is projected    *
  *                 to be fixed in interim fix version 7.1.1.1   *
  *                 and fix pack version 7.1.2.0. Note that this *
  *                 information is subject to change at the      *
  *                 discretion of IBM until the fixing levels    *
  *                 are actually available.                      *
  *                                                              *
  *                 After the fixing level has been installed:   *
  *                                                              *
  *                 1. If you circumvented the problem by        *
  *                    renaming or moving the Data Protection    *
  *                    for Microsoft Hyper-V license file        *
  *                    (tdp4hyperv.lic), put the license file    *
  *                    back to its original location with its    *
  *                    original name. The default location for   *
  *                    this file is                              *
  *                    C:\Program Files\Common Files\            *
  *                       Tivoli\TSM\license                     *
  *                                                              *
  *                 2. Perform an "incremental forever full"     *
  *                    (-mode=iffull) backup for all Hyper-V     *
  *                    virtual machines in order to establish    *
  *                    a new incremental forever backup chain.   *
  *                                                              *
  *                 3. Resume Normal "incremental forever        *
  *                    incremental" (-mode=ifincr) backups.      *
  ****************************************************************
  

Problem conclusion

• The data mover logic has been fixed so that changed data blocks
  are correctly identified and backed up.
  

Temporary fix

Comments

APAR Information

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

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

  IT04942

Modules/Macros

• DSMAGENT DSMCSVC
  

Fix information

• Fixed component name

  TSM CLIENT

• Fixed component ID

  5698ISMCL

Applicable component levels

• R71W PSY

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