Not a full server-rack but had 4 desktops (2-side by side on either side of my small desk) running a variety of stuff in my first two years of university (CS1.6

Not a full server-rack but had 4 desktops (2-side by side on either side of my small desk) running a variety of stuff in my first two years of university (CS1.6 servers, WoW emu server, network bridge, teamspeak, DC server) - one was my personal computer. In 3rd year it went up to 5 since my room was slightly bigger and my friend would often come play games in my room (he didn't have internet).