3Ware 9650SE-2LPB-10 CLI Guide - Page 19
RAID 6, RAID 5 Configuration Example
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Understanding RAID Levels and Concepts Figure 3. RAID 5 Configuration Example RAID 6 RAID 6 requires a 3ware 9650SE RAID controller. RAID 6 provides greater redundancy and fault tolerance than RAID 5. It is similar to RAID 5, but has two blocks of parity information (P+Q) distributed across all the drives of a unit, instead of the single block of RAID 5. Due to the two parities, a RAID 6 unit can tolerate two hard drives failing simultaneously. This also means that a RAID 6 unit may be in two different states at the same time. For example, one sub-unit can be degraded, while another may be rebuilding, or one sub-unit may be initializing, while another is verifying. RAID 6 requires a minimum of five drives. Performance and storage efficiency also increase as the number of drives increase. www.3ware.com 13