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How RAID groups work

A RAID group consists of one or more data disks or array LUNs, across which client data is striped and stored, and up to two parity disks, depending on the RAID level of the aggregate that contains the RAID group.

RAID-DP uses two parity disks to ensure data recoverability even if two disks within the RAID group fail.

RAID4 uses one parity disk to ensure data recoverability if one disk within the RAID group fails.

RAID0 does not use any parity disks; it does not provide data recoverability if any disks within the RAID group fail.