Veritas 9.1 device drivers fail backup

[Judy5305]

I am running Veritas backup exec 9.1 on a windows 2003 small business server. I run a full backup every night of approx. 16Gb of data. We had a problem where our backups were not running, Dell replaced the travan drive, cable and system board. That seemed to be where the problem was. The backups are now running with one exception. I am using the microsoft driver on the tape drive and my backups are 100% successful. As soon as I put the Veritas driver on the backups fail with the following error: 45d - The request could not be performed because of an I/O device error.
Also my backups used to take approx. 7 hours to run before this incident. Now with the Microsoft driver it takes them 27 hours. Once I put the Veritas driver on there the backup time decreases to the usual 7 hours but they fail. Any ideas why this is happening? Or how I can correct this? I need to have the appropriate amount of backup time which should be approx. 7 hours.
Thanks in advance

 

[justin2000]

Bad tape drive/controller?

are u getting any events in teh system log when u get the I/O error?

have u tried driver from dell for the drive?

 

[Judy5305]

Yes I receive an error in the event log which says:

The driver detected a controller error on \Device\Tape0.

I haven't tried the dell driver. It's definately not the drive because this is the third drive from dell and all of them act the same way. And I would think that if it was the drive or controller you would get the same error if you were using microsoft or Veritas drivers.
Strange thing last night the backup ran on 16 gb of data for only 7 hours, so I don't know what the reason for slow backup is.

 

[justin2000]

you will be surprised how many times i have heard, i have replaced the drive and still getting the errors.
you either have a bad scsi card, cable, terminator, tape or drive lots of choices.

the error is coming from the operating system.

u tried updating scsi card drivers?

MS drivers are pretty basic - you will usually find that the veritas drivers have more error checking of some sort in them.