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There’s been interest in the hardware that has driven the sites of The Robot Co-op over 2.5 million requests/day so here it is:

The four web servers are more fluke than planning, we don’t need the capacity they have just yet. We started with two webservers, a database server and a staging/mail/backend server, all dual 3GHz Xeons. We then added a third webserver and after that the Opteron MySQL box. The old webserver was recently repurposed as a webserver.

Site traffic is currently spread across all four web boxes as each box runs all of our sites by a hardware load balancer of unknown manufacture. Eventually we’ll switch to running the 43 Things on a pair of machines and all other sites on the remaining machines.

Images are routed through a separate IP directly to WEBrick running a custom HTTPServlet that interacts with MogileFS to serve and resize images.