Ever since Apple discontinued the Xserve, network administrators have had to come up with creative ways to build new OS X based servers. You can still purchase a Mac Mini with OS X Server on it, but one Mac Mini isn’t enough to support some hardcore server needs.
Steve was trying to put together a Macintosh processing based rack, but when he couldn’t find any XServes in the marketplace, he decided to come up with his own homemade solution – stuff 160 Mac minis into a custom made rack. The end result is brilliant.