With the development of 60 GHz technology, data centers are going to be wireless. A fundamental challenge in wireless data center networking is how to efficiently use 60 GHz wireless technology to improve the performance. Many existing works have been proposed for this, but most of them do not perform well in connectivity or may not be flexible for different environments in data centers. This paper presents Graphite, a novel network structure that has many desirable features for wireless data

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... nters. The whole architecture can be suitable for several different deployments of data centers. In Graphite, the problem of link blockage can be properly solved. Graphite makes best use of the propagation distance of 60 GHz and allows one server to communicate with as many other servers as possible. Graphite also improves the average node degree, which is more than any other existing wireless topologies on the same condition. Furthermore, Graphite can be suitable for data center with different deployments. We build a small testbed of Graphite to demonstrate its ability to solve the problem of link blockage. Results from theoretical analysis and extensive evaluations show that Graphite is a viable wireless topology for data center networks. Index Terms-60 GHz, topology design, wireless data center.