I am surprised to know that Amazon has a data center that is comparable with google’s one.

Huan Liu's Blog

(Edit 3/16/2012: I am surprised that this post is picked up by a lot of media outlets. Given the strong interest, I want to emphasize what is measured and what is derived. The # of server racks in EC2 is what I am directly observing. By assuming 64 physical servers in a rack, I can derive the rough server count. But remember this is an *assumption*. Check the comments below that some think that AWS uses 1U server, others think that AWS is less dense. Obviously, using a different assumption, the estimated server number would be different. For example, if a credible source tells you that AWS uses 36 1U servers in each rack, the number of servers would be 255,600. An additional note: please visit my disclaimer page. This is a personal blog, only represents my personal opinion, not my employer’s.)

Similar to the EC2 CPU utilization rate

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