Also written by Stephen Lawson:
IBM and Cisco will make Watson into a virtual workmate
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Google's data centers grow too fast for normal networks, so it builds its own

CIO.com

Google has been building its own software-defined data-center networks for 10 years because traditional gear can’t handle the scale of what are essentially warehouse-sized computers. The company hasn’t said much before about that homegrown infrastructure, but one of its networking chiefs provided some details on Wednesday at Open Network Summit and in a blog post. The current network design, which powers all of Google’s data centers, has a maximum capacity of 1.13 petabits per second.