The Sandia National Laboratory computer annex conducts the hourly walk through of the thunderbird supercomputer at 2 a.m.
All Sandia computer systems are monitored at all hours of the day and night to make sure they are safe and secure. In 2006, Sandia's Thunderbird Linux cluster was ranked the sixth fastest supercomputer in the world on the Top 500 supercomputing list.
Original public domain image from Flickr