This may not be of assistance to the Megaraid question I have, but installing the system on one of the drives listed in the installer installs to just one drive.
Even though HW RAID in active, it only access the individual disk. I tried to use software RIAD in it's place, but after I made the md devices, the system would go extremely slow, and lockup at 72% of reading the partition information after I 'Finish' with the software RAID section. Thanks for any help