We have a Dell system which was initially set up on the cheap
using the on board SATA controller (S100). It runs
software RAID with a mirror of two sata disks. We found
it was sufficient for operations, but a full backup service
takes about 16 hours to backup 200 GB so this isn't so good.
A Perc H700 controller was ordered, and it seems there is
no way to use it as a straight controller. It can only use
the hardware raid configuration. I'd be happy to learn there
is a way to make it work as a straight through controller, so
please correct me if this is wrong.