Do you have the latest build of DSSv6? as you may need a new driver for your RAID, so update to the latest build could help you to get the latest drivers needed.

Also try to tune your system, you can find that in the KB at:
http://kb.open-e.com/42/
and
http://kb.open-e.com/How-can-we-impr...eter_1083.html