Raid Levels; Distributed Data Guarding - Compaq N2400 - TaskSmart - 1 GB RAM Administration Manual

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Appendix

RAID Levels

Distributed Data Guarding

Distributed data guarding, also called RAID 5, stores parity data across all the
drives in the array. Spreading the parity across all the drives allows more
simultaneous read operations and higher performance than data guarding
(RAID 4). If one drive fails, the controller uses the parity data and the data on
the remaining drives to reconstruct data from the failed drive. RAID 5 allows
the system to continue operating with reduced performance until you replace
the failed drive. If more than one drive fails, RAID 5 also fails, and all data in
the array is lost.