Adaptec SAS/SATA/SCSI RAID Controllers - Manual (Page 77)

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.
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%
ŠŠŠ ŠŠŠ
No 2
RAID 1 Yes 50%
ŠŠ ŠŠ
No 2
RAID 1E Yes 50%
ŠŠ ŠŠ
No 3
RAID 10 Yes 50%
ŠŠ ŠŠ
No 4
RAID 5 Yes 67 – 94%
ŠŠŠ Š
No 3
RAID 5EE Yes 50 – 88%
ŠŠŠ Š
Yes 4
RAID 50
1
1 Because they support four disk drives only, the Adaptec 2420SA RAID controller can’t support RAID 50 or RAID 60
arrays.
Yes 67 – 94%
ŠŠŠ Š
No 6
RAID 6 Yes 50 – 88%
ŠŠ Š
No 4
RAID 60
1 Yes 50 – 88% ŠŠ Š No 8