Recently I had a discussion with a teacher of mine. He was claiming that you could set up RAID 1 with five drives and that the data would be mirrored over all of these drives.
I told him a RAID 1 with 5 drives wouldn't work like that. It would be a RAID 1 with two drives and would use the other three drives as hot spare.
He also said that RAID 6 is identical to RAID 5 but you can place all the parity checks on the same drive. I thought RAID 6 was a RAID 5-like solution where two drives where used for parity.
Who's right, then?