Symptoms

Consider the following scenario:

  • In Windows Server 2008, "Microsoft Hyper-V VSS Writer" is not listed when you run the vssadmin list writers command.

  • When you perform a backup of the Hyper-V virtual machines, the following event is logged to the Hyper-V-VMMS event log:

In this scenario, the backups of the virtual machines may be inconsistent because the Hyper-V VSS writer is not used during the backup job.

Cause

This problem occurs because of corrupted or invalid virtual machine configuration files.

Resolution

Service Pack Information

To resolve this problem, obtain the latest service pack for Windows Server 2008. For more information, click the following article number to view the article in the Microsoft Knowledge Base:

968849 How to obtain the latest service pack for Windows Server 2008

Update information

The following file is available for download from the Microsoft Download Center:

Download Download the Update for Windows Server 2008 x64 Edition (KB956697) package now.

For more information about how to download Microsoft support files, click the following article number to view the article in the Microsoft Knowledge Base:

119591 How to obtain Microsoft support files from online services
Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help prevent any unauthorized changes to the file.


Release Date: September 9, 2008

For more information about how to download Microsoft support files, click the following article number to view the article in the Microsoft Knowledge Base:

119591 How to obtain Microsoft support files from online services
Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help prevent any unauthorized changes to the file.

Prerequisites

You must have Windows Server 2008 installed to apply this update.

Restart requirement

You do not have to restart the computer after you apply this update.

Update replacement information

This update does not replace any other updates.

File information

The English version of this update has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time item in Control Panel.

Windows Vista and Windows Server 2008 file information notes
  • The .manifest files and the .mum files that are installed in each environment are listed separately in the "Additional file information for Windows Server 2008 and for Windows Vista" section. These files and their associated .cat (security catalog) files are critical to maintaining the state of the updated component. The .cat files are signed with a Microsoft digital signature. The attributes of these security files are not listed.

  • The binary files that apply to a specific product, milestone (RTM, SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table:

    Version

    Product

    Milestone

    Service branch

    6.0.6000.16xxx

    Windows Server 2008 SP1

    SP1

    GDR

    6.0.6001.22xxx

    Windows Server 2008 SP1

    SP1

    LDR

For all supported 64-bit versions of Windows Server 2008

File name

File version

File size

Date

Time

Platform

Vmms.exe

6.0.6001.18125

3,871,232

20-Aug-2008

04:01

x64

Vmms.exe

6.0.6001.22247

3,871,232

20-Aug-2008

04:44

x64

Status

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

More Information

After you apply this update, the following event will continue to be logged. However, you can safely ignore the event.
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

Additional file information for Windows Server 2008

Additional files for all supported 64-bit versions of Windows Server 2008

File name

Amd64_f97e0aa14ea570b77b803a675103a80c_31bf3856ad364e35_6.0.6001.18125_none_0aca2a61230e33dd.manifest

File version

Not Applicable

File size

703

Date (UTC)

21-Aug-2008

Time (UTC)

00:51

Platform

Not Applicable

File name

Amd64_ffdaca8b2f859655546d39218a9d88b3_31bf3856ad364e35_6.0.6001.22247_none_543c9b8120756c63.manifest

File version

Not Applicable

File size

703

Date (UTC)

21-Aug-2008

Time (UTC)

00:51

Platform

Not Applicable

File name

Amd64_microsoft-hyper-v-vstack-vmms_31bf3856ad364e35_6.0.6001.18125_none_92a406a41755daae.manifest

File version

Not Applicable

File size

249,723

Date (UTC)

20-Aug-2008

Time (UTC)

04:35

Platform

Not Applicable

File name

Amd64_microsoft-hyper-v-vstack-vmms_31bf3856ad364e35_6.0.6001.22247_none_931a042b3081e508.manifest

File version

Not Applicable

File size

249,723

Date (UTC)

20-Aug-2008

Time (UTC)

05:27

Platform

Not Applicable

File name

Package_1_for_kb956697_bf~31bf3856ad364e35~amd64~~6.0.1.1.mum

File version

Not Applicable

File size

1,847

Date (UTC)

21-Aug-2008

Time (UTC)

00:51

Platform

Not Applicable

File name

Package_1_for_kb956697~31bf3856ad364e35~amd64~~6.0.1.1.mum

File version

Not Applicable

File size

2,560

Date (UTC)

21-Aug-2008

Time (UTC)

00:51

Platform

Not Applicable

File name

Package_2_for_kb956697_bf~31bf3856ad364e35~amd64~~6.0.1.1.mum

File version

Not Applicable

File size

1,847

Date (UTC)

21-Aug-2008

Time (UTC)

00:51

Platform

Not Applicable

File name

Package_2_for_kb956697~31bf3856ad364e35~amd64~~6.0.1.1.mum

File version

Not Applicable

File size

2,560

Date (UTC)

21-Aug-2008

Time (UTC)

00:51

Platform

Not Applicable

File name

Package_for_kb956697_sc_0_bf~31bf3856ad364e35~amd64~~6.0.1.1.mum

File version

Not Applicable

File size

1,505

Date (UTC)

21-Aug-2008

Time (UTC)

00:51

Platform

Not Applicable

File name

Package_for_kb956697_sc_0~31bf3856ad364e35~amd64~~6.0.1.1.mum

File version

Not Applicable

File size

1,528

Date (UTC)

21-Aug-2008

Time (UTC)

00:51

Platform

Not Applicable

File name

Package_for_kb956697_sc_bf~31bf3856ad364e35~amd64~~6.0.1.1.mum

File version

Not Applicable

File size

1,411

Date (UTC)

21-Aug-2008

Time (UTC)

00:51

Platform

Not Applicable

File name

Package_for_kb956697_sc~31bf3856ad364e35~amd64~~6.0.1.1.mum

File version

Not Applicable

File size

1,430

Date (UTC)

21-Aug-2008

Time (UTC)

00:51

Platform

Not Applicable

File name

Package_for_kb956697_server_0_bf~31bf3856ad364e35~amd64~~6.0.1.1.mum

File version

Not Applicable

File size

1,509

Date (UTC)

21-Aug-2008

Time (UTC)

00:51

Platform

Not Applicable

File name

Package_for_kb956697_server_0~31bf3856ad364e35~amd64~~6.0.1.1.mum

File version

Not Applicable

File size

1,532

Date (UTC)

21-Aug-2008

Time (UTC)

00:51

Platform

Not Applicable

File name

Package_for_kb956697_server_bf~31bf3856ad364e35~amd64~~6.0.1.1.mum

File version

Not Applicable

File size

1,419

Date (UTC)

21-Aug-2008

Time (UTC)

00:51

Platform

Not Applicable

File name

Package_for_kb956697_server~31bf3856ad364e35~amd64~~6.0.1.1.mum

File version

Not Applicable

File size

1,438

Date (UTC)

21-Aug-2008

Time (UTC)

00:51

Platform

Not Applicable

File name

Update-bf.mum

File version

Not Applicable

File size

1,770

Date (UTC)

21-Aug-2008

Time (UTC)

00:51

Platform

Not Applicable

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