Event ID 12378 — VSS Shadow Copy Provider Operations

Applies To: Windows Server 2008 R2

Volume Shadow Copy Service (VSS) providers manage running volumes and create shadow copies of them on demand.

Event Details

Product:	Windows Operating System
ID:	12378
Source:	VSS
Version:	6.1
Symbolic Name:	VSS_ERROR_RESYNC_CANT_OPENDEST
Message:	The LUN resynchronization operation failed because the destination disk could not be found or because another application holds an exclusive handle to the destination LUN. Make sure that all applications have released their handles to the LUN and retry the operation. %1

This event indicates that the destination disk could not be found or that another application holds an exclusive handle to a destination LUN.

Possible resolutions include:

Ensure that the destination disk exists and is online.
Close any application that might have an open handle to the disk drive indicated by the event. If necessary, contact the application vendor about this problem. You can use a utility called Process Explorer to view handles to the root directory on the disk. For information and download instructions for Process Explorer, see https://go.microsoft.com/fwlink/?LinkId=157123. If the destination disk is online, no application has an open handle to it, and the issue is still not resolved, restart the computer.

To perform this procedure, you must have membership in Administrators, or you must have been delegated the appropriate authority.

To ensure that the destination disk exists and is online:

Open an elevated Command Prompt. Click Start, click All Programs, click Accessories, right-click Command Prompt, and then click Run as administrator.
Type diskpart at the command prompt, and then press Enter.
Type list disk and press Enter.
Type select disk <n>, where <n> is the destination disk, and then press Enter.
Type detail disk, and then press Enter.

To verify that the Volume Shadow Copy Service (VSS) providers are operating correctly, retry the previous operation.