Selecting a RAID level and tuning performance

wenaini發表於2008-06-01
AIORM

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.
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RAID levelData redundancyPhysical drive capacity utilizationRead performanceWrite performanceBuilt-in spare driveMin. number of drivesMax. number of drives
RAID level-0 No100%SuperiorSuperiorNo116
RAID level-1 Yes50%Very highVery highNo22
RAID level-1E Yes50%Very highVery highNo316
RAID level-5 Yes67% to 94%SuperiorHighNo316
RAID level-5E Yes50% to 88%SuperiorHighYes416
RAID level-5EE Yes50% to 88%SuperiorHighYes416
RAID level-6 Yes50% to 88%Very HighHighNo416
RAID level-00 No100%SuperiorSuperiorNo260
RAID level-10 Yes50%Very highVery highNo416
RAID level-1E0 Yes50%Very highVery highNo660
RAID level-50 Yes67% to 94%SuperiorHighNo660 (SCSI) 128 (SAS, SATA)
RAID level-60 Yes50% to 88%Very HighHighNo8128
Spanned Volume No100%SuperiorSuperiorNo248
RAID Volume No50% to 100%SuperiorSuperiorNo448

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.

來自 “ ITPUB部落格 ” ，連結：http://blog.itpub.net/79686/viewspace-1004900/，如需轉載，請註明出處，否則將追究法律責任。

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