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Array Configuration Planner
Using the Array Configuration Planner The following table lists the possible RAID levels, fault
tolerance, and effective capacity for all possible drive configurations for an array
consisting of one to seven drives. This table does not take into account any hot spare
(standby) drives. You should always have a hot spare drive in case of drive failure. RAID
1 requires two physical drives. RAID 3 and RAID 5 require at least three drives. RAID 10
requires at least four drives, while RAID 30 and RAID 50 require at least six drives.
Number of
Drives
1
1
2
2
2
3
3
3
3
4
4
4
4
4
5
5
5
5
6
6
6
6
6
6
6
7
7
7
7
8
8
8
8
8
8
8
Possible
Relative
RAID Levels
Performance
None
Excellent
RAID 0
Excellent
None
Excellent
RAID 0
Excellent
RAID 1
Good
None
Excellent
RAID 0
Excellent
RAID 3
Good
RAID 5
Good
None
Excellent
RAID 0
Excellent
RAID 3
Good
RAID 5
Good
RAID 10
Good
None
Excellent
RAID 0
Excellent
RAID 3
Good
RAID 5
Good
None
Excellent
RAID 0
Excellent
RAID 3
Good
RAID 5
Good
RAID 10
Good
RAID 30
Good
RAID 50
Good
None
Excellent
RAID 0
Excellent
RAID 3
Good
RAID 5
Good
None
Excellent
RAID 0
Excellent
RAID 3
Good
RAID 5
Good
RAID 10
Good
RAID 30
Good
RAID 50
Good
Chapter 5 Configuring MegaRAID Express 500
Fault
Effective
Tolerance
Capacity
No
100%
No
100%
No
100%
No
100%
Yes
50%
No
100%
No
100%
Yes
67%
Yes
67%
No
100%
No
100%
Yes
75%
Yes
75%
Yes
50%
No
100%
No
100%
Yes
80%
Yes
80%
No
100%
No
100%
Yes
83%
Yes
83%
Yes
50%
Yes
67%
Yes
67%
No
100%
No
100%
Yes
86%
Yes
86%
No
100%
No
100%
Yes
87%
Yes
87%
Yes
50%
Yes
75%
Yes
75%
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