The total capacity of the array is:
(n x cs) - cs = tc
n = number of drives
cs= capacity of the smallest drive
tc = total capacity
So if you have 3 drives, and they are 2x500GB and 1x750GB the total capacity will be:
(3 x 500) - 500 = 1000GB
So the optimal RAID 5 array is formed with drives of the same size.
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