Since there seems to be a bit of confusion, here's the various RAID levels:
(btw, RAID = Redundant Array of Inexpensive Disks)
Level 0: Striping, no parity. Data written in parallel.
Level 1: Mirroring. Written redundantly, read independently.
Level 2: Striped, partial parity. Data records bit-interleaved across
drive groups.
Level 3: Striped, dedicated parity drive. Parallel writes. Very large
stripe RAID 5 is equivalent to RAID 3 (more or less).
Level 4: Data records sector-interleaved across disk groups. Dedicated
Parity drive.
Level 5: Striped. Parity interleaved between drives. Small stripe RAID 3
is equivalent to RAID 5.
Level 0+1: Striped, then mirrored. Parallel mirrored writes.
Level 1+0: Mirrored, then striped.
JBOD: Just a Bunch Of Disks. In other words, no RAID level, no mirroring,
no striping, no redundancy, no parity. Concatenation falls under
this category.
Hope this helps,
--Mark
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