An update is available for Windows Server 2008-based computers to address issues with backing up and restoring Hyper-V virtual machines

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Symptoms

This article describes the issues that are fixed in this Hyper-V update for Windows Server 2008-based computers that have the Hyper-V role enabled.

Issue 1

If you back up a Hyper-V virtual machine that has multiple volumes, the backup may fail. If you check the VMMS event log after the backup failure occurs, the following event is logged:

Issue 2

The Microsoft Hyper-V VSS Writer may enter an unstable state if a backup of the Hyper-V virtual machine fails. If you run the vssadmin list writers command, the Microsoft Hyper-V VSS Writer is not listed. To return the Microsoft Hyper-V VSS Writer to a stable state, the Hyper-V Virtual Machine Management service must be restarted.

Issue 3

You cannot restore a Hyper-V virtual machine if the virtual machine was configured to use a legacy network adapter.

Resolution

To resolve this issue, install the service pack or update that is described in this section. After you install the update on the Host computer, you have to install the updated Integration Components on each Guest computer before this update becomes fully effective. To do this, open the Virtual Machine Connection for the Guest computer in Hyper-V Manager, and then select the Insert Integration Services Setup Disk option on the Action menu. Installation of the Integration Services starts automatically on the Guest computer, but you must click Yes to continue.


Notes

  • On a Windows Server 2008-based computer, the updated Integration Services are listed as KB960242 in the Programs and Features item in Control Panel.

  • On a Windows Vista-based computer, the updated Integration Services are listed as KB960243 in the Programs and Features item in Control Panel.

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

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 Web site:

http://support.microsoft.com/contactus/?ws=supportNote 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.

Important Windows Vista and Windows Server 2008 hotfixes are included in the same packages. However, only one of these products may be listed on the “Hotfix Request” page. To request the hotfix package that applies to both Windows Vista and Windows Server 2008, just select the product that is listed on the page.

Prerequisites

Before you apply this update, the release version of Hyper-V must be installed. For more information, click the following article number to view the article in the Microsoft Knowledge Base:

950050 Description of the update for the release version of the Hyper-V technology for Windows Server 2008

Restart requirement

You have to restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace any other previously released hotfixes.

File information

The English version of this hotfix 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 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 64-bit versions of Windows Server 2008" 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.

Windows Server 2008, 64-bit versions

File name

File version

File size

Date

Time

Platform

Vmms.exe

6.0.6001.22352

3,872,256

13-Jan-2009

02:42

x64

Blank.vfd

Not Applicable

1,474,560

18-Dec-2007

21:18

Not Applicable

Vid.dll

6.0.6001.22352

37,888

13-Jan-2009

05:01

x64

Vmbuspipe.dll

6.0.6001.22352

15,872

13-Jan-2009

05:01

x64

Vmbusvdev.dll

6.0.6001.22352

83,968

13-Jan-2009

05:01

x64

Vmguest.iso

Not Applicable

42,584,064

21-Dec-2008

23:20

Not Applicable

Vmprox.dll

Not Applicable

178,688

13-Jan-2009

05:01

x64

Vmwpctrl.dll

66.0.6001.22352

87,040

13-Jan-2009

05:01

x64

Windowsvirtualization.mof

Not Applicable

406,536

13-Jan-2009

00:52

Not Applicable

Windowsvirtualizationuninstall.mof

Not Applicable

572

11-Jul-2008

20:06

Not Applicable

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 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 64-bit versions of Windows Server 2008

File name

File version

File size

Date

Time

Platform

Amd64_5ea2a0e012fba496634951da2e3c633f_31bf3856ad364e35_6.0.6001.22352_none_898535921950c54c.manifest

Not Applicable

703

14-Jan-2009

00:09

Not Applicable

Amd64_08d4dc4f14b70e82efea40a20802f63d_31bf3856ad364e35_6.0.6001.22352_none_c03e75641cbceedb.manifest

Not Applicable

698

14-Jan-2009

00:09

Not Applicable

Amd64_microsoft-hyper-v-vstack-vmms_31bf3856ad364e35_6.0.6001.22327_none_932fa5e93071aa4d.manifest

Not Applicable

249,723

13-Jan-2009

5:28

Not Applicable

Amd64_microsoft-hyper-v-vstack_31bf3856ad364e35_6.0.6001.22327_none_c157114ac5a25cab.manifest

Not Applicable

45,508

13-Jan-2009

5:23

Not Applicable

Package_1_for_kb959962~31bf3856ad364e35~amd64~~6.0.3.0.mum

Not Applicable

2,563

14-Jan-2009

00:09

Not Applicable

Package_2_for_kb959962~31bf3856ad364e35~amd64~~6.0.3.0.mum

Not Applicable

2,563

14-Jan-2009

00:09

Not Applicable

Package_for_kb959962_sc_0~31bf3856ad364e35~amd64~~6.0.3.0.mum

Not Applicable

1,528

14-Jan-2009

00:09

Not Applicable

Package_for_kb959962_sc~31bf3856ad364e35~amd64~~6.0.3.0.mum

Not Applicable

1,430

14-Jan-2009

00:09

Not Applicable

Package_for_kb959962_server_0~31bf3856ad364e35~amd64~~6.0.3.0.mum

Not Applicable

1,532

14-Jan-2009

00:09

Not Applicable

Package_for_kb959962_server~31bf3856ad364e35~amd64~~6.0.3.0.mum

Not Applicable

1,438

14-Jan-2009

00:09

Not Applicable

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