The startup time increases or hangs at the logon “Welcome” screen if you frequently backup Hyper-V virtual machines on a Windows Server 2008 R2 system

On a computer that is running Windows Server 2008 R2 and that has the Hyper-V role installed, the startup time of the computer keeps increasing. After a while, the computer stops responding when the computer is in the startup process.

Note If the computer runs some virtual machines, this issue usually occurs when you frequently back up all the disks on the computer.

Additionally, many of the following PlugPlayManager events that have Event ID 12 are logged in the System log:

Note

• The size of the %SystemRoot%\system32\confg\system system registry hive increases after every backup operation..
• If you view the registry hive by using Registry Editor, the following registry entries are logged repeatedly. For example, the following registry entries are logged repeatedly 10000 times or more.
  
  HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\SCSI\Disk&Ven_Msft&Prod_Virtual_Disk
  
  
  HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Enum\STORAGE\Volume\{f1030a29-1024-11df-b7a9-001b214f4bef}#0000000006500000
  
  
  HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\DeviceClasses\{53f5630d-b6bf-11d0-94f2-00a0c91efb8b}\##?#STORAGE#VOLUME#{E717314D-23B5-11DF-AA86-001B214F4BEF}#0000000000100000#{53f5630d-b6bf-11d0-94f2-00a0c91efb8b}

  "DeviceInstance"="STORAGE\\Volume\\{e717314d-23b5-11df-aa86-001b214f4bef}#0000000000100000"

This issue occurs because there are a large amount of orphaned registry keys.

The Volume Shadow Copy Service (VSS) snapshots create many registry keys. However, they are not deleted after the VSS snapshot operations are completed.

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: 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 Windows Server 2008 R2. Additionally, you must have the Hyper-V role installed.

Registry information

To use the hotfix, you do not have to change the registry.

Restart requirement

You have to 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 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 extremely important to maintaining the state of the updated component. 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

For all supported IA-64-based versions of Windows Server 2008 R2

To work around this issue, perform one of the following operations:

• At a command prompt, type the following command, and then press ENTER:
  devnodeclean /r
  Note This command cleans up all the orphaned registry key entries.
• Schedule the devnodeclean /r command to run one time every week.

For more information about the devnodeclean command, click the following article number to view the article in the Microsoft Knowledge Base:

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

For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:

Additional file information

Additional file information for Windows Server 2008 R2

Additional files for all supported x64-based versions of Windows Server 2008 R2

Additional files for all supported IA-64-based versions of Windows Server 2008 R2