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What is meant by redundancy, parity or parity data?

April 26, 2017Data meant parity redundancy

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What is meant by redundancy, parity or parity data?

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Redundancy means that there is protection against any single disk failure. Parity data is information used by a RAID system to rebuild the data on a disk in the event of a failure. Parity data is created by using a logical exclusive-OR (XOR) on actual user data and storing the result on disk. Example: If an array of 5 drives exists, the 4 drives are used as the storage devices and the 5th as the parity drive. Data on the first sector of each of the 4 data drives is XORed creating parity data that is stored on the first sector of the parity drive. The same holds true for the second sector.