Adaptec 2093500 User Guide - Page 74
Selecting the Best RAID Level, general, the more drives, the better the performance.
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Appendix B: Understanding RAID ● 74 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. RAID level RAID 0 Redundancy No Disk Drive Usage 100% Read Performance Write Performance Built-in Hot Spare No Minimum Disk Drives 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 501 Yes 67 - 94% No 6 RAID 6 Yes 50 - 88% No 4 RAID 60* Yes 50 - 88% No 8 1 Because it supports a maximum of four disk drives, the Adaptec 2420SA RAID controller can't support RAID 50 or RAID 60. 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.