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Data written to one disk drive is simultaneously written to another disk
drive. If one disk fails, the other disk can be used to run the system and
reconstruct the failed disk. The primary advantage of mirroring is 100% data redundancy.
Because the disk is mirrored, it does not matter if one of the disks fails. Both
disks contain the same data at all times and either disk can act as the
operational disk. Disk mirroring provides 100% redundancy, but is expensive because
each drive in the system is duplicated.
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