Open Software Solutions

Source: Microsoft Support

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Important This article contains information about how to modify the registry. Make sure that you back up the registry before you modify it. Make sure that you know how to restore the registry if a problem occurs. For more information about how to back up, restore, and modify the registry, click the following article number to view the article in the Microsoft Knowledge Base:
256986 (http://vkbexternal/VKBWebService/ViewContent.aspx?scid=kb;EN-US;256986&PortalId=1) Description of the Microsoft Windows registry

 

In a Hyper-V guest operating system, dynamic disks attached to SCSI controllers will fail to show as available after a reboot. Only after activating the dynamic disk in disk management will it and any other dynamic disks come online.  When you restart, the same issue reoccurs again.

 

This behavior is not seen with basic disks attached to a SCSI Controller or with basic or dynamic disks attached to the IDE controller.

 

 

 

In disk management the disks are shown as Dynamic and Online, but where you should see the partition type (NTFS/FAT) the drive shows as FAILED.  You may receive an error similar to the following:

 

Event Type:      Error

Event Source:   dmboot

Event Category:            None

Event ID:          3

Date:                18-07-2008

Time:               17:03:17

User:                N/A

Computer:        W2K3SP2X64

Description:

dmboot: Failed to start volume Volume3 (G:)

 

For more information, see Help and Support Center at: http://go.microsoft.com/fwlink/events.asp (http://go.microsoft.com/fwlink/events.asp)

Data:

0000: 00000000 004e0003 00000000 c0500003

0010: 00000000 00000000 00000001 00000000

0020: 00000000 00000000

 

To workaround this issue do the following:

In disk management right click on one of the failed dynamic disks, select ‘Reactivate Volume’

You’ll be prompted with the following:  Warning: We recommend that you run chkdsk on the volume after it becomes available for use Click on [OK]. After disk management refreshes, you’ll be able to access the previously failed dynamic disks.

 

To resolve this issue do the following:

Warning Serious problems might occur if you modify the registry incorrectly by using Registry Editor or by using another method. These problems might require that you reinstall the operating system. Microsoft cannot guarantee that these problems can be solved. Modify the registry at your own risk.

Edit the registry of the child virtual machine:

 

Under HKEY_LOCAL_MACHINE SYSTEM CurrentControlSet Services storvsc

Change Start value from 3 to 0.

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