37signals (and DHH) love Xen 4 Jan 08

37signals, the team behind popular productivity apps such as Basecamp, Backpack and Campfire, recently posted some stats which make fascinating reading. Of greater interest to us, though, is their use of Xen virtualisation for parts of the server infrastructure and the plans to upgrade more servers to Xen over the next couple of months, reducing their physical server count from 30 to 16 whilst remaining at around 100 cores.

DHH, Mr Rails himself, in another comment says of Xen:

Wonderful system. Strongly recommended for anyone building out a cluster.

What better recommendation to you need that Xen is a perfect solution for Rails hosting and scaling?!