An event may be logged after you restart Windows Server 2008: "Event ID: 5 Message: The Virtual Storage Filter Driver is disabled through the registry. It is inactive for all disk drives"

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SYMPTOMS

After you restart Windows Server 2008, the following event may be logged in the System log:

Log Name: System
Source: storflt
Event ID: 5
Level: Warning
Task Category: None
Message: The Virtual Storage Filter Driver is disabled through the registry. It is inactive for all disk drives.

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This event is logged when the virtual storage filter driver cannot attach to the virtual storage device. The virtual storage filter driver is included in Windows Server 2008. This driver optimizes the performance of disk I/O if Windows Server 2008 is running on a Microsoft Hyper-V Server. If Windows Server 2008 is not running on a Hyper-V Server, this event is logged.

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RESOLUTION

If Windows Server 2008 is not running on a Hyper-V Server, this issue will not affect the performance of the operating system. Therefore, you can safely ignore this event.

This issue has been fixed in the Hyper-V Release Candidate update for Windows Server 2008. For more information about this update, click the following article number to view the article in the Microsoft Knowledge Base:

949219 (http://support.microsoft.com/kb/949219/ ) Description of the Hyper-V Release Candidate update for Windows Server 2008

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