Concatenation
|
No gain
|
No gain
|
No gain
|
N/A
|
1 or 2 depending on the controller
|
More cost efficient than redundant RAID levels. Use for noncritical data.
|
RAID 0
|
None
|
Very Good
|
Very Good
|
N/A
|
N
|
Noncritical data.
|
RAID 1
|
Excellent
|
Very Good
|
Good
|
Good
|
2 N (N = 1)
|
Small databases, database logs, and critical information.
|
RAID 5
|
Good
|
The 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
|
2 N 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
|
The 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
|