I recently put Cent 5.2 (64 bit) on a new server using a Supermicro pdsbm-ln2+ sys board. I did the original installation at home using the 5.2 dvd I got via torrent.
Try a software-RAID. (I just assume you used the built-in RAID, which is more likely than not a cheap pseudo-RAID - there's a reason why even Microsoft doesn't use it in their home-server product....)
indeed, a quick lookup of that board says its ICH7R 'intel matrix' raid, which is indeed pseudo-raid, implemented in the BIOS and drivers. http://www.supermicro.com/products/motherboard/Xeon3000/946/PDSBM-LN2+.cfm