"Failure happens continuously in the Netflix infrastructure. Software needs to be able to deal with failing hardware, failing network connectivity and many other types of failure. Even if failure doesn't occur naturally, it is induced forcefully using The Simian Army. The Simian Army consists of a number of (software) "monkeys" that randomly introduce failure. For instance, the Chaos Monkey randomly brings servers down and the Latency Monkey randomly introduces latency in the network. Ensuring that failure happens constantly makes it impossible for the team to ignore the problem and creates a culture that has failure resilience as a top priority."
http://www.infoq.com/news/2013/06/netflix?utm_source=infoq&utm_medium=popular_links_homepage
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