A virtual machine online backup fails in Windows Server 2008 R2 when the SAN policy is set to "Offline All"

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Article ID: 2521348 - View products that this article applies to.
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SYMPTOMS

When the Storage Area Network (SAN) policy is set to Offline All, a virtual machine online backup fails on a computer that is running Windows Server 2008 R2. Additionally, the following event is logged in the Microsoft-Windows-Hyper-V-VMMS-Admin log:

Source: Microsoft-Windows-Hyper-V-VMMS
Date: <date>
Event ID: 10137
Task Category: None
Level: Error
Keywords:
User: SYSTEM
Computer: Computer name
Description:
No snapshots to revert were found for virtual machine 'VMName'. (Virtual machine ID <GUID>)

CAUSE

This issue occurs because the Hyper-V Volume Shadow Copy Service (Hyper-V VSS) writer has to mount snapshots of virtual hard disks (VHD) during the virtual machine online backup. The Hyper-V VSS writer expects VHDs to be mounted automatically in Windows Server 2008 R2. However, VHDs cannot be mounted automatically when the SAN policy is set to Offline All. Therefore, the virtual machine online backup fails.

RESOLUTION

This hotfix fixes the Hyper-V VSS writer by bringing the disks online so that the backup continues.

Hotfix information

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing the problem described in this article. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft website:
http://support.microsoft.com/contactus/?ws=support
Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.

Prerequisites

To apply this hotfix, you must be running one of the following operating systems:
  • Windows Server 2008 R2
  • Windows Server 2008 R2 Service Pack 1 (SP1)
Additionally, you must have the Hyper-V role installed.

For more information about how to obtain a Windows 7 or a Windows Server 2008 R2 service pack, click the following article number to view the article in the Microsoft Knowledge Base:
976932 Information about Service Pack 1 for Windows 7 and for Windows Server 2008 R2

Registry information

To use the hotfix in this package, you do not have to make any changes to the registry.

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace a previously released hotfix.

File information

The global version of this hotfix installs files that have the attributes that are listed in the following tables. The dates and the times for these files are listed in Coordinated Universal Time (UTC). The dates and the times for these files on your local computer are displayed in your local time together with your current daylight saving time (DST) bias. Additionally, the dates and the times may change when you perform certain operations on the files.
Windows Server 2008 R2 file information notes
Important Windows 7 hotfixes and Windows Server 2008 R2 hotfixes are included in the same packages. However, hotfixes on the Hotfix Request page are listed under both operating systems. To request the hotfix package that applies to one or both operating systems, select the hotfix that is listed under "Windows 7/Windows Server 2008 R2" on the page. Always refer to the "Applies To" section in articles to determine the actual operating system that each hotfix applies to.
  • The files that apply to a specific product, SR_Level (RTM, SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table.
    Collapse this tableExpand this table
    VersionProductSR_LevelService branch
    6.1.760 0 . 20xxxWindows Server 2008 R2RTMLDR
    6.1.760 1 . 21xxxWindows Server 2008 R2SP1LDR
  • The MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed separately in the "Additional file information for Windows Server 2008 R2" section. MUM and MANIFEST files, and the associated security catalog (.cat) files, are very important for maintaining the state of the updated components. The security catalog files, for which the attributes are not listed, are signed with a Microsoft digital signature.
For all supported x64-based versions of Windows Server 2008 R2
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Vmms.exe6.1.7600.209274,509,18418-Mar-201104:24x64
Vmms.exe6.1.7601.216864,628,48018-Mar-201104:21x64

STATUS

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

MORE INFORMATION

For more information about SAN, visit the following MSDN website:
http://msdn.microsoft.com/en-us/library/gg252636
For more information about the software updates and hotfixes for Hyper-V in Windows Server 2008 R2, visit the following website:
Hyper-V Update List for Windows Server 2008 R2
For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updates
For more information about disabled automount feature causes backup failure, click the following article number to view the article in the Microsoft Knowledge Base:
2004712 Description of Unable to backup Live Virtual Machines in Server 2008 R2 Hyper-V

Additional file information

Additional file information for Windows Server 2008 R2

Additional files for all supported x64-based versions of Windows Server 2008 R2
Collapse this tableExpand this table
File nameAmd64_5fac311edf68be2796db8fd35ab1d797_31bf3856ad364e35_6.1.7600.20927_none_e3376d1bd32d246a.manifest
File versionNot applicable
File size703
Date (UTC)18-Mar-2011
Time (UTC)14:47
PlatformNot applicable
File nameAmd64_7d43a5bc81f7d789a86001e2e0022f79_31bf3856ad364e35_6.1.7601.21686_none_e72c985c61e5c844.manifest
File versionNot applicable
File size703
Date (UTC)18-Mar-2011
Time (UTC)14:47
PlatformNot applicable
File nameAmd64_microsoft-hyper-v-vstack-vmms_31bf3856ad364e35_6.1.7600.20927_none_93577fac9188d8f8.manifest
File versionNot applicable
File size316,002
Date (UTC)18-Mar-2011
Time (UTC)07:39
PlatformNot applicable
File nameAmd64_microsoft-hyper-v-vstack-vmms_31bf3856ad364e35_6.1.7601.21686_none_94fbfafa8ee0d60c.manifest
File versionNot applicable
File size341,338
Date (UTC)18-Mar-2011
Time (UTC)07:05
PlatformNot applicable
File nameUpdate.mum
File versionNot applicable
File size1,953
Date (UTC)18-Mar-2011
Time (UTC)14:47
PlatformNot applicable

Properties

Article ID: 2521348 - Last Review: April 27, 2011 - Revision: 4.0
APPLIES TO
  • Windows Server 2008 R2 Datacenter
  • Windows Server 2008 R2 Enterprise
  • Windows Server 2008 R2 Standard
Keywords: 
kbautohotfix kbqfe kbhotfixserver kbfix kbexpertiseinter kbsurveynew kbexpertiseadvanced KB2521348

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