Comparing Raid Levels - Adaptec ASR-6805Q 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 No
RAID 1 Yes
RAID 1E Yes
RAID 10 Yes
RAID 5 Yes
RAID 5EE Yes
RAID 50 Yes
RAID 6 Yes
RAID 60 Yes
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.
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
Disk Drive Read
Performance
Usage
100% ***
50% **
50% **
50% **
67 – 94% ***
50 – 88% ***
67 – 94% ***
50 – 88% **
50 – 88% **
Write Built-in Hot
Performance Spare
*** No
** No
** No
** No
* No
* Yes
* No
* No
* No
Minimum
Disk Drives
2
2
3
4
3
4
6
4
8
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