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.
Minimum
Disk Drives
Built-in Hot
Spare
Write
Performance
Read
Performance
Disk Drive
Usage
Redundancy
RAID Level
2
No
***
***
100%
No
RAID 0
2
No
**
**
50%
Yes
RAID 1
3
No
**
**
50%
Yes
RAID 1E
4
No
**
**
50%
Yes
RAID 10
3
No
*
***
67 – 94%
Yes
RAID 5
4
Yes
*
***
50 – 88%
Yes
RAID 5EE
6
No
*
***
67 – 94%
Yes
RAID 50
4
No
*
**
50 – 88%
Yes
RAID 6
8
No
*
**
50 – 88%
Yes
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.
81
Proprietary and Confidential to PMC-Sierra, Inc.
Document No.: CDP-00277-02-A Rev. A, Issue:
Serial Attached SCSI RAID Controllers Installation and User's Guide