Users Guide

RAID Level Data Availability Read
Performance
Write
Performance
Rebuild
Performance
Minimum Disks
Required
Suggested Uses
RAID 1 Excellent Very Good Good Good 2N (N = 1) Small databases,
database logs,
and critical
information.
RAID 5 Good Sequential reads:
good.
Transactional
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
environments
(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.
Transactional
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
No-RAID
In Storage Management, a virtual disk of unknown metadata is considered a No-RAID volume. Storage Management does not support this
type of virtual disks. These must either be deleted or the physical disk must be removed. Storage Management allows Delete and Rename
operation on No-RAID volumes.
Understanding RAID concepts
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