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Diagram of a RAID 6 setup, which is identical to RAID 5 other than the addition of a second parity block. RAID 6 extends RAID 5 by adding another parity block; thus, it uses block-level striping with two parity blocks distributed across all member disks. [28] RAID 6 requires at least four disks.
RAID 60, also called RAID 6+0, combines the straight block-level striping of RAID 0 with the distributed double parity of RAID 6, resulting in a RAID 0 array striped across RAID 6 elements. It requires at least eight disks.
RAID 6 consists of block-level striping with double distributed parity. Double parity provides fault tolerance up to two failed drives. Double parity provides fault tolerance up to two failed drives. This makes larger RAID groups more practical, especially for high-availability systems, as large-capacity drives take longer to restore.
Row diagonal parity is a scheme where one dedicated disk of parity is in a horizontal "row" like in RAID 4, but the other dedicated parity is calculated from blocks permuted ("diagonal") like in RAID 5 and 6. [1] Alternative terms for "row" and "diagonal" include "dedicated" and "distributed". [2]
RAID; Erasure Coding; While technically RAID can be seen as a kind of erasure code, [5] "RAID" is generally applied to an array attached to a single host computer (which is a single point of failure), while "erasure coding" generally implies multiple hosts, [3] sometimes called a Redundant Array of Inexpensive Servers (RAIS). The erasure code ...
In the case of a RAID 3 array of 12 drives, 11 drives participate in the XOR calculation shown above and yield a value that is then stored on the dedicated parity drive. Extensions and variations on the parity bit mechanism "double," "dual," or "diagonal" parity, are used in RAID-DP.
RAID 1 – Mirror. RAID 4 – Like RAID 0, but with an extra device for the parity. RAID 5 – Like RAID 4, but with the parity distributed across all devices. RAID 6 – Like RAID 5, but with two parity segments per stripe. RAID 10 – Take a number of RAID 1 mirrorsets and stripe across them RAID 0 style.
N (for N≥2) logical chunks to N+1 physical chunks across N+1 block devices, with 1 physical chunk used as parity raid6 N (for N≥2) logical chunks to N+2 physical chunks across N+2 block devices, with 2 physical chunks used as parity. N is the number of block devices still having free space when the chunk is allocated. If N is not large ...