Symantec Backup Exec Issues

I have seen this before. Part of this is Backup Exec 12. If you upgrade to 12.5, that will help the problem but not solve it. The other part is the the drive unit. Check your tape drive with the manufacturer tools. We had errors with the heads starting to go out on ours.

Bottom Line:
We ended up moving to USB hard drives for our backup. It was cheaper to purchase the hard drives than a new tape drive and tapes to match. Taking the SCSI card out freed up I/O resources in our server. It is just as portable and offsite as tapes. Use a small portable fire safe (Lunch box size) with a foam liner to protect the drives from shock. (Tested with 10' drop to concrete floor with no errors.)

What kind of drive do you use?

Its a Dell Powervault 110 LTO-2,

You should be able to download DELL tape drive diagnostic software and run tests, check firmware etc. If I can remember right it is called tapeRX and can be downloaded from here:

http://dell.driversdown.com/dell-drivers-downloads/Dell-PowerVault-110T-LTO_9321.shtml

Try some tests and see if there are any issues with the drive itself. If not then we can look more into Backup Exec.