Glossary

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parity

An integer’s quality of being odd or even. See also parity bit, parity checking.

Redundant information that is associated with a block of information. Parity is a calculated value used to reconstruct data after a failure.

RAID-5 volumes stripe data and parity intermittently across a set of disks. Within each stripe, the data on one disk is parity data and the data on the other disks is normal data. RAID-5 volumes, therefore, require at least three disks to allow for this extra parity information. When a disk fails, the parity information on the good disks can be used to recreate the data on the failed disk.

A calculated value that can be used to reconstruct data after a failure. While data is being written to a RAID-5 volume, parity is also calculated by performing an exclusive OR (XOR) procedure on data. The resulting parity is then written to the volume. If a portion of a RAID-5 volume fails, the data that was on that portion of the failed volume can be recreated from the remaining data and the parity.

Redundant information that is associated with a block of information. Parity is a calculated value used to reconstruct data after a failure.

RAID-5 volumes stripe data and parity intermittently across a set of disks. Within each stripe, the data on one disk is parity data and the data on the other disks is normal data. RAID-5 volumes, therefore, require at least three disks to allow for this extra parity information. When a disk fails, Symantec software uses the parity information on the good disks to recreate the data on the failed disk.

See RAID-5 Volume.