http://workinghardinit.wordpress.com/2014/01/08/how-to-measure-iops-of-a-virtual-machine-with-resource-metering-and-measurevm/?utm_medium=social&utm_source=twitter.com&utm_campaign=buffer&utm_content=buffer2fff1

(Source: https://twitter.com/JanEgilRing/status/421609631119843328)