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Parity
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Parity

With the principle of parity, a parity block is generated from the blocks of user data by XOR operations. In the case of RAID 3 (byte level) and RAID 4 (block level), this is stored, for example, on a separate (dedicated) hard disk (parity disk) of the network; in the case of RAID 5, distribution is carried out equally on all hard disks involved, with RAID 6 the parity information is created twice across all hard drives. If a block with user data is lost, it can be recovered using the parity block.

As an example:

Information one: 9

Information two: 14

Information three: 21

Information four: 38

Parity: 82

9 + 14 + 21 + 38 = 82

If one of the four pieces of information is now lost, the missing original information can be recovered with the parity and the other information:

Information one: 9

Information two: 14

Information three: 21

Information four: 38

Parity:: 82

82 - (9 + 14 + 21) = 38

This means that both RAID 3, RAID 4 and RAID 5 can cope with the failure of a hard drive without the RAID failing. Due to the double parity with RAID 6, even the failure of two data carriers is manageable.

Common RAID level:

Dipl. Ing. Nicolas Ehrschwendner
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