> Three SC846 24x3.5" 4U can be had for no more than $400/ea and, theres 36bay versions. Because then you need three times the rack space. What you don't spend

> Three SC846 24x3.5" 4U can be had for no more than $400/ea and, theres 36bay versions. Because then you need three times the rack space. What you don't spend one-time for the hardware you'll spend extra every month for rack space, connectivity, cooling, power etc. You might use that budget for redundancy, for example.