y = no. of chassis
z = number of discs in RAID after parity taken away
a = capacity of disc
b = percentage loss when formatting volume
((((y*2)-1)*z)*a)-b) = usable capacity
Or, if its a basic raid
(Total TB pre format - 1) * size of disks - 10% = Usable Capacity
With thanks to Sammy Aindow...
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