Adaptec 2420SA User Guide - Page 77
Selecting the Best RAID Level, general, the more drives, the better the performance.
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Appendix B: Understanding RAID ● 77 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 601 Yes 50 - 88% No 8 1 Because they support four disk drives only, the Adaptec 2420SA RAID controller can't support RAID 50 or RAID 60 arrays. 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.