User's Manual

54 Understanding RAID Concepts
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.
Tran sa ct ion
al reads:
Very good
Fair, unless
using write-
back 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.
Table 3-1. RAID Level and Concatenation Performance Comparison (continued)
RAID
Level
Data
Availability
Read
Performance
Write
Performance
Rebuild
Performance
Minimum
Disks
Required
Suggested
Uses
N = Number of physical disks
X = Number of RAID sets