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Disk Mirroring
With mirroring (used in RAID 1), data written to one hard disk drive is simultaneously
written to another hard disk drive. If one hard disk drive fails, the contents of the other
hard disk drive can be used to run the system and regenerate the failed hard disk drive.
The primary advantage of disk mirroring is that it provides 100% data redundancy. Since
the contents of the hard disk drive are completely written to a second hard disk drive, it
does not matter if one of the hard disk drives fails. Both hard disk drives contain the same
data at all times. Either hard disk drive can act as the operational hard disk drive.
Disk mirroring provides 100% redundancy, but is expensive because each hard disk drive
in the system must be duplicated.
Hard Disk Drive
One
Segment One
Segment Two
Segment Three
Segment Four
Hard Disk Drive
Two
Segment One Duplicated
Segment Two Duplicated
Segment Three Duplicated
Segment Four Duplicated
Appendix A : RAID 213
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