Comparing Raid Levels; Understanding Drive Segments - Adaptec 5405 User Manual

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.
RAID Level Redundancy
RAID 0
RAID 1
RAID 1E
RAID 10
RAID 5
RAID 5EE
RAID 50
RAID 6
RAID 60
Spanned Volume
RAID Volume
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

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.
Read
Disk Drive Usage Performance
No 100% ✱ ✱ ✱
Yes 50%
Yes 50%
Yes 50%
Yes 67% – 94%
✱ ✱ ✱
Yes 50% – 88% ✱ ✱ ✱
Yes 67% – 94%
✱ ✱ ✱
Yes 50% – 88%
Yes 50% – 88%
No 100%
✱ ✱ ✱
No 50% – 100% ✱ ✱ ✱
Appendix B: Selecting the Best RAID Level
Write Built-in Hot
Performance Spare
✱ ✱ ✱ No
No
✱ ✱ ✱ ✱
✱ ✱ ✱ ✱ No
✱ ✱ ✱ ✱ No
No
✱
✱ Yes
No
✱
✱ ✱ ✱ No
✱ ✱ ✱ No
No
✱ ✱ ✱
✱ ✱ ✱ No
page 154.
153
●
Minimum
Disk Drives
2
2
3
4
3
4
6
4
8
2
4