EMC CX500I Configuration Guide - Page 43
RAID Benefits and Trade-offs, RAID 1/0 Group mirrored RAID 0 Group; a RAID 0 Group - review
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RAID Types and Trade-offs RAID Benefits and Trade-offs This section reviews RAID types and explains their benefits and trade-offs. You can bind disks into seven types of logical units (LUNs): ◆ RAID 5 Group (individual access array) ◆ RAID 3 Group (parallel access array) ◆ RAID 1 mirrored pair ◆ RAID 1/0 Group (mirrored RAID 0 Group); a RAID 0 Group mirrored by the storage-system hardware ◆ RAID 0 Group (nonredundant individual access array); no inherent high-availability features ◆ Individual unit; no inherent high-availability features ◆ Hot spare; serves only as an automatic replacement for any disk in a RAID type other than 0; does not store data during normal system operations Plan the disk unit configurations carefully. After a disk has been bound into a LUN, you cannot change the RAID type of that LUN without unbinding it, and this means losing all data on it. Table 2-1 compares the read and write performance and relative cost per gigabyte (Gbyte) of the RAID types. Figures shown are theoretical maximums. RAID Benefits and Trade-offs 2-13