Computers get faster and smaller every year, but in the case of servers – the building blocks for many modern businesses – the tasks we expect them to perform have increased to match. We so rely on these servers that we increasingly need to monitor what they do, how they do it and when they hit problems. An under appreciated aspect of modern server designs is that they now incorporate facilities to monitor themselves and report problems: a small computer built into a bigger server to monitor it used to be reserved for very expensive systems, but now even the cheapest 1U Dell server comes with this kind of monitoring and control.