I have recently migrated a server form SBS 2003 to SBS 2008. When I try to do a backup or
the scheduled backup runs it fails within 10 seconds with the error "A volume shadow copy service failed
Unknown error (0x800423f4)".
When I check the event logs there are 3 events:
1. VSS - Event ID 12290 - ASR writer error 0x80042404. hr=0x000000000
2. SPP - Event ID 16387 - The backup failed due to a missing disk for a dynamic volume.
3. BACKUP - Event ID 521 - Backup started at "**/**/**** 00:00:00" failed as Volume shadow copy operation failed for backup.
I am backing up to a NAS drive configured as a iscsi. and checked it is online and functioning correctly.
I have tried to set C:\ drive OS to active partition but I was unsuccessful as the disk is dynamic.
I have restarted Volume Shadow copy sevices.
I have removed SQL from the server completely.
Please ask if you require any other information.