User`s guide

Appendix B: Selecting the Best RAID Level ● 154
Comparing RAID Levels
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.
More information about each RAID level is available beginning on page 155.
Understanding Drive Segments
A drive segment is a disk drive or portion of a disk drive that is used to create a logical drive. A disk drive can include both RAID segments
(segments that are part of a logical drive) and available segments. Each segment can be part of only one logical drive at a time. If a disk
drive is not part of any logical drive, the entire disk is an available segment.
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 8
Spanned Volume No 100%
✱ ✱ ✱ ✱ ✱ ✱
No 2
RAID Volume No 50% – 100%
✱ ✱ ✱ ✱ ✱ ✱
No 4