Appendix B: Understanding RAID
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Selecting the Best RAID Level
Use this table to select the RAID levels that are most appropriate for the logical drives on your
storage space, based on the number of available disk drives and your requirements for
performance and reliability.
Disk drive usage, read performance, and write performance depend on the number of drives in
the logical drive. In general, the more drives, the better the performance.
RAID Level
Redundancy
Disk Drive
Usage
Read
Performance
Write
Performance
Built-in
Hot Spare
Minimum
Disk
Drives
RAID 0
No
100%
No
2
RAID 1
Yes
50%
No
2
RAID 1E
Yes
50%
No
3
RAID 10
Yes
50%
No
4
RAID 5
Yes
67 – 94%
No
3
RAID 5EE
Yes
50 – 88%
Yes
4
RAID 50
Yes
67 – 94%
No
6
RAID 6
Yes
50 – 88%
No
4
RAID 60
Yes
50 – 88%
No
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