[LUNI] simple RAID question

[luther rochester]

I'm setting up a new Dell Poweredge 2950 server for work. I've never 
done RAID before, and I'm a bit confused.

The machine has 8 x 73GB drives on a PERC 5/I RAID controller.

I was under the impression I could set this up in RAID 1 so I would end 
up with 4 mirrored 73GB drives. However, when I set it up for RAID 1 and 
installed, now my OS doesn't recognize any drives other than the single 
73GB.

Was I wrong in assuming I could configure it multiple ways (the only 
options on setup were whether I wanted RAID 1,3,5, or 10)? Does 1 
controller = one drive?

Please help a RAID noob out.

Thanks,
luther