By Duncan Graham-Rowe, Technology Review
Inside the huge data centers operated by Internet companies like Google, Amazon, and Facebook, information is processed at blistering speed, but it still has to be moved between different machines through relatively slow wiring. In theory, this bottleneck could be avoided by adding wired links between racks, but that would be very expensive and, short of a complete architectural redesign, not particularly practical. Transmitting data wirelessly would be simpler, but achieving the required speed would normally require a line-of-sight connection, which is impossible in a packed data center.
http://www.technologyreview.com/communications/39367/?p1=A4
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