Selecting a RAID level and tuning performance

Disk arrays are used to improve performance and reliability. The amount of improvement depends on the application programs that you run on the server and the RAID levels that you assign to the logical drive.

Each RAID level provides different levels of fault-tolerance (data redundancy), utilization of physical drive capacity, and read and write performance. In addition, the RAID levels differ in regard to the minimum and maximum number of physical drives that are supported.

When selecting a RAID level for your system, consider the following factors.

Note: Not all RAID levels are supported by all ServeRAID controllers.

RAID level Data redundancy Physical drive capacity utilization Read performance Write performance Built-in spare drive Min. number of drives Max. number of drives
RAID level-0 No 100% Superior Superior No 1 16
RAID level-1 Yes 50% Very high Very high No 2 2
RAID level-1E Yes 50% Very high Very high No 3 16
RAID level-5 Yes 67% to 94% Superior High No 3 16
RAID level-5E Yes 50% to 88% Superior High Yes 4 16
RAID level-5EE Yes 50% to 88% Superior High Yes 4 16
RAID level-6 Yes 50% to 88% Very High High No 4 16
RAID level-00 No 100% Superior Superior No 2 60
RAID level-10 Yes 50% Very high Very high No 4 16
RAID level-1E0 Yes 50% Very high Very high No 6 60
RAID level-50 Yes 67% to 94% Superior High No 6 60 (SCSI)
128 (SAS, SATA)
RAID level-60 Yes 50% to 88% Very High High No 8 128
Spanned Volume No 100% Superior Superior No 2 48
RAID Volume No 50% to 100% Superior Superior No 4 48

Physical drive utilization, read performance, and write performance depend on the number of drives in the array. Generally, the more drives in the array, the better the performance.

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