Appendix B: Understanding RAID ● 89
Selecting the Best RAID Level
Use the Table below 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
Maximum
Disk Drives
RAID 0 No 100% No 1 16
RAID 1 Yes 50% No 2 2
RAID 1E Yes 50% No 3 16
RAID 10 Yes 50% No 4 16
RAID 5 Yes 67 – 94% No 3 16
RAID 5EE Yes 50 – 88% Ye s 4 1 6
RAID 50
1
1 Because it supports a maximum of four disk drives, the Adaptec 2420SA RAID controller can’t support RAID 50 or RAID 60.
Yes 67 – 94% No 6 128
RAID 6 Yes 50 – 88% No 4 16
RAID 60
*
Yes 50 – 88% No 8 128
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