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Redundancy, redundancy, redundancy
Facebook likes to think it broke the theory of typical data center design with its high levels of redundancy. Much like with the cooling fans, where one clicks on if another fails, the same goes with the power. The facility has a reserve bus in the power system that allows them to switch between primary and reserve power. In previous data centers that had to be done by switching to generators.
Community can accelerate the pace of innovation
This is the Open Compute database server, one of the latest Open Compute projects. The new design uses flash for storage and is a 40-percent efficiency win compared to previous database devices. It's all solid state with no moving parts, giving it faster response and easier storability. Facebook officials said that open sourcing the things the company's built interally — and then building a community around those designs — has made them better, faster.
Efficient technology is vanity free
Those pizza box-looking cardboard slabs stuffed between the server trays are not there to warm lunch — they're there to force air down to the servers to cool them off. Traditional server towers also typically come with a plastic bezel on the front, but the team found out that by not putting them on there's no longer a need to commission the plastic or deploy it, and as a bonus the fans in the back don't have to work as hard (which obviously saves more engery). Facebook's message here: Looks are secondary to utility and efficiency.