Users Guide

RAID Level Data
Availability
Read
Performanc
e
Write
Performanc
e
Rebuild
Performanc
e
Minimum
Disks
Required
Suggested
Uses
critical
information.
RAID 5 Good Sequential
reads: good.
Transactiona
l reads: Very
good
Fair, unless
using
writeback
cache
Fair N + 1 (N = at
least two
disks)
Databases
and other
read
intensive
transactional
uses.
RAID 10 Excellent Very Good Fair Good 2N x X Data
intensive
environment
s (large
records).
RAID 50 Good Very Good Fair Fair N + 2 (N = at
least 4)
Medium
sized
transactional
or data
intensive
uses.
RAID 6 Excellent Sequential
reads: good.
Transactiona
l reads: Very
good
Fair, unless
using
writeback
cache
Poor N + 2 (N = at
least two
disks)
Critical
information.
Databases
and other
read
intensive
transactional
uses.
RAID 60 Excellent Very Good Fair Poor X x (N + 2) (N
= at least 2)
Critical
information.
Medium
sized
transactional
or data
intensive
uses.
N = Number of physical disks
X = Number of RAID sets
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