Once upon a time, but not that long ago, data center servers were much like their own self-contained cities. Getting them to talk to one another on a reliable, sure-fire basis was akin to wizardry. And making sure they ran trouble free 24 x 7 was a constant battle. It was an age where IT professionals dreaded the sound of their pager signaling an issue—usually at two in the morning. It was an age of solder and steel, of magic blue screens, and of issues of draconic proportions that needed to be overcome. It was an age of constant vigilance.