Disk Array FC60 User's Guide (A5277A)

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RAID Level Disk Striping Mirroring Parity
Handle multiple disk
failures?
RAID 0 Yes No No No. RAID 0 offers no data
redundancy or protection
against disk failure. RAID 0
should only be used for non-
critical data. The failure of a
single disk in a RAID 0 LUN
will result in the loss of all
data on the LUN.
RAID 1 No Yes No No
RAID 0/1 Yes Yes No Yes, providing both disks in
a mirrored pair do not fail.
RAID 3 Yes No Yes No
RAID 5 Yes No Yes No
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RAID Level Storage Efficiency
RAID 0 100%. All disk space is use for data storage.
RAID 1 and 0/1 50%. All data is duplicated, requiring twice the disk storage for a
given amount of data capacity.
RAID 3 and 5 One disk’s worth of capacity from each LUN is required to store
parity data. As the number of disks in the LUN increases, so does
the storage efficiency.
3-disk LUN: 66%
4-disk LUN: 75%
5-disk LUN: 80%
6-disk LUN: 83%