As part of the SCinet Research Sandbox at the IEEE/ACM International Conference for High Performance Computing, Networking, Storage and Analysis (SC11), Indiana University utilized a dedicated 100 Gbps wide area network (WAN) link spanning more than 3,500 km (2,175 mi) to demonstrate the capabilities of the Lustre high performance parallel file system in a high bandwidth, high latency WAN environment. This demonstration functioned as a proof of concept and provided an opportunity to study Lustre's performance over a 100 Gbps WAN. To characterize the performance of the network and file system a series of benchmarks and tests were undertaken. These included low level iperf network tests, Lustre networking tests, file system tests with the IOR benchmark, and a suite of real-world applications reading and writing to the file system. All of the tests and benchmarks were run over a the WAN link with a latency of 50.5 ms. In this article we describe the configuration and constraints of the demonstration and focus on the key findings regarding the networking layer for this extremely high bandwidth and high latency connection. Of particular interest are the challenges presented by link aggregation for a relatively small number of high bandwidth connections, and the specifics of virtual local area network routing for 100 Gbps routing elements.
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