4
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.
2. Installing SATA Hard Disks
STEP 1: Install the SATA hard disks into the drive bays.
STEP 2: Connect one end of the SATA data cable to the motherboard
’
s primary
SATA connector (SATA_1).
STEP 3: Connect the other end of the SATA data cable to the master SATA hard
disk.
STEP 4: Connect one end of the second SATA data cable to the motherboard
’
s
secondary SATA connector (SATA_2).
STEP 5: Connect the other end of SATA data cable to the secondary SATA hard
disk.
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