Avid Adrenaline and Upgrading Storage

Hello all,
I am currently upgrading the storage on our Avid MCA. I have some questions about Ciprico MediaVault and the host computer I am using.

We are coming off of a blistering production pace that has lasted almost 3 years...good problem to have...but we have not upgraded much of anything, except Adobe apps, along the way.
My current system is as follows:
Avid MCA V2.0, HP XW8000 host computer, NVIDIA Quadro4 980 XGL graphics, Integrated LSI Ultra 320 SCSI contoller, Win XP pro SP2. Pyro64 FW card in slot 3.

I have purchased a MediaVault U320-S Dual Max (MV) and it seems to have issues with something in my system. I had it striped across both channels in 1/4 TB partitions, to keep the OMFI databases under control, and it performed well for a few days. Then I started getting DIO errors in the Avid during capture. Then when copying OMFI files to it from my older "rack & stack" Avid drives, the MediaVault crashed hard and disk managment showed all the partitions as "failed". After talking with Ciprico and running failed tests on the MV, I sent it back to Ciprico, as it was only 2 weeks old, and they tested the drives and controllers and everything was fine...their tech support is awesome by the way. Thanks Victor!!!

It seems to be a communication issue between the computer and the MV that caused the problem. I have thought about purchasing an ATTO SCSI controller but due to conflicts with internal components that use certain segments of the PCI resources and compatiblity with the older HP, I'm not sure if I can use an add-in card and if I can, which do I need? I am thinking that the ATTO UL3D U160 is the card that is compatable with the HP XW8000 but the UL4D U320 may also work...not sure. If I do use either of these cards, which slot of the HP would it go into?

TIA,
Mark