I worked at Amazon from 2001-2006 and there were a couple of datacenter-wide power outages during my time and there was always some machines that never came bac

I worked at Amazon from 2001-2006 and there were a couple of datacenter-wide power outages during my time and there was always some machines that never came back. It is just a numbers game. When you have thousands of servers affected some small fraction just don't survive the forced power cycle.