Server capacity questions

[Greg Woods]

Don't forget to consider the number of disk CONTROLLERS as well as the
number of disks. You aren't likely to be able to get twice the bandwidth
through one controller by adding a second disk, and that will quickly
become your bottleneck. If you're going to have two of everything in an
attempt to run 2*N clients, make sure that includes a separate controller
for each disk as well.

--Greg