Recently at Yardstick, I completely rebuilt the server infrastructure for our high stakes online testing platform, Yardstick Measure. We need our data in Canada, so we have some physical servers running VMWare ESXi. I set up five front-end servers to run the actual exams on, and other servers that do other things: handle the database, the admin interface, search, redis etc. The front-end servers are load balanced behind a pair of firewalls confi…