When you break a software mirrored RAID volume by using the Diskpart tool, the Windows Server 2003 System event log records:
Event Type: Error
Event Source: Volsnap
Event Category: None
Event ID: 8
Description: The flush and hold writes operation on volume C: timed out while waiting for a release writes command.
This behavior is caused by a problem in the DmAdmin service (Logical Disk Manager Administrative Service).
The event does NOT indicate a problem, and can be safely ignored.