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There is immense power in air pressurization
Air is moved throughout the data center entirely by pressurization. Although the photo doesn't show it, heavy suction is wafting air from one side to the next. The area is so pressurized that each corridor entrance has a double-door vestibule to stabilize the pressure. That air is eventually pushed down a shaft into the server hall where it's pulled across the electronics to cool them off. Then that air is sent to the hot aisle and eventually pushed into the plenum, where it's either recycled or sent out the back.
A little water goes a long way
Nothing inside the data center's cooling mechanism is custom made, including this Munters mesh that uses water to regulate the temperature and refresh the air. The system creates a climate with an optimized combination of temperature and humidity — while also using 80 percent less energy than traditional cooling methods. McCammon said the system has also allowed them to eliminate the need for reverse osmosis and cut down on water usage, as water collected from the system is continually reused.
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.