why it can't be say 5 disks+parity?
The reason is in the definition on "RAID 3", which says the updates to the
RAID device must be atomic. In some ideal universe, RAID 3 is implemented in
hardware and on individual bytes, but here we cannot write to the drives in
units other than sectorsize and sectorsize is 512 bytes.
OK i understand - the RAID sectors must be 2^something, so amount of
drives must be 2^something+1.
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