With mirroring
(used in RAID 1), data written to one disk is simultaneously written
to another disk. If one disk fails, the contents of the other disk
can be used to run the system and rebuild the failed physical disk.
The primary advantage of disk mirroring is that it provides complete
data redundancy. Both disks contain the same data at all times. Either
of the physical disks can act as the operational physical disk.
Disk mirroring provides complete redundancy, but is an expensive
option because each physical disk in the system must be duplicated.
NOTE:Mirrored physical
disks improve read performance by read load balance.
Figure 1. Example of Disk
Mirroring (RAID 1)
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