I should point that out. Each of the 3 shelfs has dual power supplies as well. As a whole the thing is fairly loud and puts out quite a bit of heat. We actually just moved and I have the server rack only partially setup still. One of the things I still need to do is put and exhaust blower in for the closet it is in. With the SAN, 2 cable modems, an 8 port phone modem, 48 port switch, router, firewall, 3 servers (also loud and hot), KVM, monitor, and 2 6000va UPS's the ambient temp in there is hovering around 80 with the closet doors on both sides open. I cannot close them right now or it will all overheat.
Another of my soon to do tasks is to configure a lot of power management abilities on the servers and the SAN. They can spin arrays of drives down after a period of inactivity and 2 of the servers can essentially go into sleep mode overnight. The "closet" is actually decent size with about 18" of room on each side of the rack. This is a shot of it as of now if you are curious. installed so far, the 2 UPS's on the bottom, temporary have a workstation sitting on the UPS's for testing as well as one of the servers (running), then 2 of the SAN shelves (both running, the other is sitting in the background on the floor on it's edge) then the rack monitor/keyboard (KVM on the back of that), up top is the switch, firewall, and patch panel. The other 2 servers are on the floor sorta behind the rack running. Hoping to make time this weekend to rack everything up and cleanup the mess.