I'm facing this problem: on Windows 2003 server STD, I can't safely perform unattended data backup on tape (HP LTO-1 drive) because it asks for a free media tape after 90GB of data written. The hardware compression is enabled, so I expect to back-up a minimum of 100GB of data. But the backup stops before the nominal tape capacity, while some week ago I was able to backup 148GB of data. For example, last wednesday:
Backup started on 14/03/2012 at 23.07.
The requested media failed to mount. The operation was aborted.
The operation was ended.
Backup completed on 15/03/2012 at 3.59.
Time: 4 hours, 51 minutes, and 44 seconds
We have 130 tapes, the older is from 2005, the newest is from nov. 2011. Each tape written it's stowed in a cabinet for 14 months, after this period is rewritten (we make 2 full backups a week).
In Event Viewer there is only error 8019:
Event Type: Error
Event Source: NTBackup
Event Category: None
Event ID: 8019
End Operation: Warnings or errors were encountered.
Consult the backup report for more details.
Where should I investigate? This afternoon I have to patch the server (monthly fix) and of course reboot...
Update: from "Computer Management" I can't free a tape (the option is grayed). But from ntbackup I can free it. I think that something hanged in the system...
Update2: after the reboot, the nightly backup went OK: 98GB+System State. Let's wait some time to see if the problem is gone away...