BE 9.0 4212
Certance ( Quantum ) LTO2 HH

We have been trying speed up our backups on our server and after moving the tape drive off the RAID and onto a dedicated controler throughput did increase.

However we seem to be seeing random throughput.

On night a volume can go at 500MM the next night it's down to 80, another volume would have been 80 and is now 250.... There seems to be no pattern to the performance?

There seems to be no clue in the basic logs..

Any ideas?