The magic that makes Google tick?: Good article about the miracle that is Google. Did you know they run 60,000 servers over there? That’s a mighty big power strip.
Google indexes over four billion Web pages, using an average of 10KB per page, which comes to about 40TB. Google is asked to search this data over 1,000 times every second of every day, and typically comes back with sub-second response rates. If anything goes wrong, said Holzle, “you can’t just switch the system off and switch it back on again.”