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Ben Jai, who designed many of Google's servers, unveiled a modern Google server before the hungry eyes of a technically sophisticated audience.
Google server designer Ben Jai
Google's big surprise: each server has its own 12-volt battery to supply power if there's a problem with the main source of electricity. The company also revealed for the first time that since 2005, its data centers have been composed of standard shipping containers--each with 1,160 servers and a power consumption that can reach 250 kilowatts.
It may sound geeky, but a number of attendees--the kind of folks who run data centers packed with thousands of servers for a living--were surprised not only by Google's built-in battery approach, but by the fact that the company has kept it secret for years. Jai said in an interview that Google has been using the design since 2005 and now is in its sixth or seventh generation of design.
Google server designer Ben Jai
"It was our Manhattan Project," Jai said of the design.
Google has an obsessive focus on energy efficiency and now is sharing more of its experience with the world. With the recession pressuring operations budgets, environmental concerns waxing, and energy prices and constraints increasing, the time is ripe for Google to do more efficiency evangelism, said Urs Hoelzle, Google's vice president of operations.
"There wasn't much benefit in trying to preach if people weren't interested in it," said Hoelzle, but now attitudes have changed.
The rear side of Google's server.
Why built-in batteries?
Why is the battery approach significant? Money.
Typical data centers rely on large, centralized machines called uninterruptible power supplies (UPS)--essentially giant batteries that kick in when the main supply fails and before generators have time to kick in. Building the power supply into the server is cheaper and means costs are matched directly to the number of servers, Jai said.
"This is much cheaper than huge centralized UPS," he said.
"Therefore no wasted capacity."
Efficiency is another financial factor. Large UPSs can reach 92 to 95 percent efficiency, meaning that a large amount of power is squandered. The server-mounted batteries do better, Jai said: "We were able to measure our actual usage to greater than 99.9 percent efficiency."
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