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There is this article:

http://developer.yahoo.com/blogs/hadoop/posts/2008/09/scalin...

Which is from 2008 and which references a cluster twice the size of the facebook one, and mentions several production clusters the same size as the facebook one.

They are (obviously, this being Yahoo!) not on Amazon though.

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From the article:

That's a total of more than 21 PB of configured storage capacity! This is larger than the previously known Yahoo!'s cluster[1] of 14 PB.

Guess they are comparing data volumes. But great for pointing out that they do not have the largest in machine count.

[1] http://developer.yahoo.com/blogs/hadoop/posts/2010/05/scalab...

Define bigger? More nodes yes, but less cores, RAM and disk space.

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