Take the 2-minute tour ×
Server Fault is a question and answer site for system and network administrators. It's 100% free, no registration required.

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.
Directories: 12393
Files: 182764
Bytes: 96.219.704.680
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
Date: 15/03/2012
Time: 3.59.01
User: N/A
Computer: W3KSRV01
Description:
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...

share|improve this question

1 Answer 1

up vote 0 down vote accepted

Some thoughts:

  • If the media is old, maybe the drive has to skip some sectors because it can't reliable read the data after the write (LTO always does a verify-after-write). Try a new tape and see if you can store more data on it.
  • This shouldn't be a problem if you backup your OS, but if you backup only pre-compressed files (archives, JPGs, MP3 etc)., it might be that activating hardware compression actually increases the backup size.
share|improve this answer
    
At least one media was "new", i.e. used for the second time The type of data is a mix of DTP files (pdf, ai, indd, jpg, tiff, eps) and aother files, from the beginning. We never had a trouble until the total size was under 110GB. –  AndrewQ Mar 16 '12 at 11:12

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.