Many years ago the team I worked out got some shiny new Sun 4 machines and we soon ran out of disk space - solution was to plug a cabinet full of a few old huge disks that I think came from some kind of ancient mini into a Sun 3 and then NFS the new storage onto the Sun 4s.

It was truly bizarre to watch the cabinet judder and shake as we accessed stuff - I think there were only 2 disks in it and it was mostly full!