A non-persistent snapshot cleanup operation is aborted by VSS if the VSS hardware provider takes more than three minutes to perform this operation on a computer that is running Windows Server 2008 or Windows Vista
When the Volume Shadow Copy Service (VSS) hardware provider takes more than three minutes to clean up a non-persistent snapshot set, the operation is aborted by VSS. Therefore, the hardware provider has insufficient time to delete all non-persistent snapshots. When this problem occurs, you may experience one or more of the following symptoms:
- The hardware provider is in a bad state.
- The destination LUNs are in an inconsistent state.
- In the next VSS operations, the provider is vetoed and SCSI errors occur.
- In Device Manager, an exclamation point (!) is displayed in front of a disk device to state that the disk device does not work correctly.
Note: This issue usually occurs if the snapshot set has multiple logical unit number (LUN) devices.
For more information on this issue, including potential causes, workarounds, and resolutions, see: Microsoft KB Article KB975831.