What OS were you running the RAID config with originally (ie before installing FC5)? Must admit I'm running 3x PATA drives with my VIA chipset, haven't tried a SATA drive yet. I've never been game to try RAID (even IDE raid) simply coz if something blows up I like to be able to just unplug the drive, plug it into another whitebox and viola.
the phases of 'nix troubleshooting
:confused: | google > :D