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Raid Introduction
48
Mirroring (RAID 1)
Writes duplicate data on to a pair of drives while reads are performed in parallel. ATA RAID 1 is
fault tolerant because each drive of a mirrored pair is installed on separate IDE channels. If one
of the mirrored drives suffers a mechanical failure (e.g. spindle failure) or does not respond, the
remaining drive will continue to function. This is called Fault Tolerance. If one drive has a
physical sector error, the mirrored drive will continue to function.
RAID 1 (Mirroring)
On the next reboot, the FastBuild
TM
utility will display an error in the array and recommend to
replace the failed drive. Users may choose to continue using their PC, however Promise
recommends replacing the failed drive as soon as possible. See Chapter 4 for a functional
description.
Due to redundancy, the drive capacity of the array is half the total drive capacity. For example,
two 1GB drives that have a combined capacity of 2GB would have 1GB of usable storage. With
drives of different capacities, there may be unused capacity on the larger drive.