HP 226593-B21 Smart Array 5i Plus Controller and Battery Backed Write Cache En - Page 91
Table C-1, Summary of RAID Methods, Choosing a RAID Method, RAID 0, Most Important, Suggested RAID
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Drive Arrays and Fault Tolerance Table C-1: Summary of RAID Methods continued RAID 0 RAID 1+0 RAID 5 Tolerates failure No of one physical drive? Yes Yes Tolerates No simultaneous failure of >one physical drive? Only if no two No failed drives are in a mirrored pair Read performance High High High Write performance High Medium Low Relative cost Low High Medium *Values for usable drive space are calculated with these assumptions: • All physical drives in the array have the same capacity. • Online spares are not used. • No more than 14 physical drives are used for RAID 5. (This number is recommended so that the risk of logical drive failure is kept low. See Appendix D for further information.) Table C-2: Choosing a RAID Method Most Important Cost effectiveness Also Important I/O performance I/O performance I/O performance Cost effectiveness Fault tolerance Suggested RAID Level RAID 1+0 RAID 5 (RAID 0 if fault tolerance is not required) RAID 5 (RAID 0 if fault tolerance is not required) RAID 1+0 C-10 Compaq Smart Array 5i Plus Controller and Battery Backed Write Cache Enabler User Guide