HP Proliant ML350 Tape Drive Problem

[Craig Parsons]

We have only had this server for 5 months and in this time we have been unable to complete a full back up of any work because of the speed at which the tape drive backs up.
The tape is a HP DLT VS80 and is connected to the mother board SCSI. The raid array is working fine but we are only getting 6.33MB per Min on the back up speed.
A simple 4gb back up is taking most of an afternoon and a full back up is taking over 3 days to complete.
We use Archserve to backup our information.
Is there anyone who can tell me why this is? I have moved the Tape from SCSI 2 to 1 to see if that does anything but its still the same. I have no idea why this is happening but its very frustrating. Any Advice would be apreciated.