a colleague has set up an Ubuntu 10.04LTS server on a Dell Poweredge machine. It has a PERC RAID controller built in, but he ignored this and has used Linux software RAID. He didn't disable the HW RAID controller so it of course gives a "not configured" type of error on boot.
I'm a little concerned :-( The whole system seems to run rather slow. Could this RAID config be causing a problem?