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Understanding RAID Levels and Concepts

www.3ware.com 13

Figure 3. RAID 5 Configuration Example

RAID 6

RAID 6 requires a 3ware 9650SE or 9690SA 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.

AMCC 3ware’s implementation of RAID 6 requires a minimum of five

drives. Performance and storage efficiency also increase as the number of

drives increase.

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