This articles misses the point of the cloud. The argument for "live migrations" and lambasting of AWS for bouncing servers for the Xen exploit are both completely misguided.<p>The point of the Cloud is not that a server never restarts or has downtime. It's that your app runs on many servers in different AZs and regions such that any one server failing is not going to have a real impact and can be easily and quickly replaced.<p>AWS, when bouncing their servers, did them one az and one region at a time. Because of that, if you ran across multiple AZs you would get to test your failure scenarios, but not be down.<p>The author's focus on other cloud providers having restarts makes it sound like he's saying "Verizon is bad, but in bad company". There is no comparison to be made between taking down your whole cloud, and losing a server here and there.