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RAID Function
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)
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.
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