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Matthew MisterOct 4, 2019 11:21:06 AM< 1 min read

How is redundancy achieved in a RAID?

RAID configurations are great additions to a network server because they can add speed and redundancy depending on which setup you have. So what is redundancy and how is it achieved in a RAID?

Redundancy means that your system contains duplicate copies of a file. In the event of a failure you have another available copy to work with which is great if you can't afford to lose any of your files. Redundancy is achieved by "striping", "mirroring" or a mix of "striping and parity".

RAID 0 is the only RAID configuration that does not provide redundancy, it provides a speed boost but if a drive fails you're out of luck.

RAID 1 achieves redundancy by having identical copies of a disk which is known as data mirroring.

RAID 2 uses data striping with error correcting code to achieve redundancy.

RAID 3 uses parity information to achieve redundancy.

RAID 5 matches striping and parity to achieve data redundancy.

RAID 6 uses striping and double parity across drives to achieve redundancy.