[ddouglass]

Did a bit more research on this and Admin is partially right. It is Raid 1 but that is the Mirroring raid. I believe what they were using before was Raid 0 which stripes the data across 2 or more drives but with no parity, thus when one drive fails all data is lost. Raid 5 replaced this which gives you striped data with parity, so losing one drive does not lose the data. Replace the bad drive and the data is recovered. This is best with 3 or more drives and mostly used for servers.
Raid 1 (Mirroring) gives you two identical drives where one can take over in the event of a failure of the primary. The best set-up for this would also be to have each drive as the master on separate ribbon cables.
There is also a Raid 1 with Duplexing in which you use two drives and two separate controller cards. That gives you total redundancy so that losing a control or losing a drive will not effect operation. More expensive due to the two controllers but more reliable too.
You have got me thinking Jim and I may be joining you in this soon. Certainly couldn't hurt.