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How RAID groups work

The purpose of a RAID group is to provide parity protection from data loss across its included disks.

A RAID group consists of one or more data disks, across which client data is striped and stored, plus one or two parity disks. RAID4 uses one parity disk to ensure data recoverability if one disk fails within the RAID group. RAID-DP uses two parity disks to ensure data recoverability even if two disks within the RAID group fail.