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A study of application demands from a production datacenter of 1500 servers shows that except for a few out-liers, application demands can be generally met by a network that is slightly oversubscribed. Eliminating over-subscription is hence a needless overkill. In a significant departure from recent proposals that do so, the authors advocate a hybrid architecture. The base network is provisioned for the average case, is oversubscribed, and can be built with any of the existing network designs. To tackle the hotspots that remain, extra links are added on an on-demand basis. These links called flyways provide additional capacity where and when needed. This results show that even a few additional flyways substantially improve performance (by over 50%), as long as they are added at the right place in the network.
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