Patent ID: 7721143

Claim:
A method for reducing rebuild time on a Redundant Array of Independent Disks (RAID) device, comprising steps of: beginning or resuming a rebuild process with at least one of selecting a first stripe of said RAID device or determining a stripe of said RAID device using a last checkpoint; enabling write-back caching on a drive being built; reading at least one of data or parity from at least one other drive, said at least one other drive and said drive being built belonging to a same stripe of said RAID device; exclusive ORing (XORing), when a RAID level of said RAID device is 5, said at least one of data or parity to obtain a result; treating, when said RAID level of said RAID device is 1, said at least one of data or parity as said result; writing said result to a second drive, said second drive being a repaired, replaced, or hot-spare drive for said drive being built; checking whether a checkpoint needs updating; and during said rebuild process, providing a non-rebuild write operation to the drive being built, the non-rebuild write operation requesting a forced-unit-access write, wherein the drive being built returns a status responsive to the forced-unit-access write only after all write data of the forced-unit-access write has been written to and committed to media of the drive being rebuilt.