A Scalable, Commodity Data Center Network Architecture

A Scalable, Commodity Data Center Network ArchitectureMohammad of Computer Science and EngineeringUniversity of California, San DiegoLa Jolla, CA 92093-0404 ABSTRACTT oday s data centers may contain tens of thousands of computerswith significant aggregate bandwidth requirements. The networkarchitecture typically consists of a tree of routing and switchingelements with progressively more specialized and expensive equip-ment moving up the Network hierarchy. Unfortunately, even whendeploying the highest-end IP switches/routers, resulting topologiesmay only support 50% of the aggregate bandwidth available at theedge of the Network , while stillincurring tremendous cost. Non-uniform bandwidth among data Center nodes complicates applica-tion design and limits overall system this paper, we show how to leverage largely Commodity Eth-ernet switches to support the full aggregate bandwidth of clustersconsisting of tens of thousands of elements.

The cost for building a network interconnect for a large cluster greatly affects design decisions. As we discussed above, oversub-scription is typically introduced to lower the total cost. Here we give the rough cost of various configurations for different number of hosts and oversubscription using current best practices. We as-

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  Architecture, Network, Interconnect, Network architecture, Interconnect network

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