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RAID 1 (Mirroring)
RAID 1 writes duplicate data onto a pair of drives and reads both sets of data
in parallel. If one of the mirrored drives suffers a mechanical failure or does not
respond, the remaining drive will continue to function. Due to redundancy, the drive
capacity of the array is the capacity of the smallest drive. Under a RAID 1 setup, an
extra drive called the "spare drive". can be attached. Such a drive will be activated to
replace a failed drive that is part of a mirrored array. Due to the fault tolerance, if any
RAID 1 drive fails, data access will not be affected as long as there are other working
drives in the array.
JBOD (Spanning)
A spanning disk array is equal to the sum of the all drives when the drives
used are having different capacities. Spanning stores data onto a drive until it is full,
then proceeds to store files onto the next drive in the array. W hen any disk member
fails, the failure affects the entire array. JBOD is not really a RAID and does not
support fault tolerance.
Introduction to VIA VT6410 IDE RAID
4 - 3
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