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Re:Handling five billion sessions a day in real time by frostmatthew on Friday February 20, 2015 @09:19AM (#9080474)
It's a couple years old but What it takes to run Stack Overflow[1] lists the number of DB servers, Web servers, etc

[1] http://nickcraver.com/blog/2013/11/22/what-it-takes-to-run-s...

Re:Handling five billion sessions a day in real time by jackweirdy on Friday February 20, 2015 @10:04AM (#9080668)