These numbers are based on values from Google's production stack. Insofar as these numbers are based on Jeff Dean's post: http://highscalability.com/blog/2011/1

These numbers are based on values from Google's production stack. Insofar as these numbers are based on Jeff Dean's post: http://highscalability.com/blog/2011/1/26/google-pro-tip-use-back-of-the-envelope-calculations-to-choo.html http://highscalability.com/blog/2011/1/26/google-pro-tip-use... That being said, these numbers are roughly identical to what you can expect on AWS.