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The state-of-the-art storage architecture of high-performance computing systems was designed decades ago, and with today's scale and level of concurrency, it is showing significant limitations. Our recent work proposed a new architecture to address the I/O bottleneck of the conventional wisdom, and the system prototype (FusionFS) demonstrated its effectiveness on up to 16 K nodes-the scale on par with today's largest supercomputers. The main objective of this paper is to investigate FusionFS's scalability towards exascale. Exascale computers are predicted to emerge by 2018, comprising millions of cores and billions of threads. We built an event-driven simulator (FusionSim) according to the FusionFS architecture, and validated it with FusionFS's traces. FusionSim introduced less than 4 percent error between its simulation results and FusionFS traces. With FusionSim we simulated workloads on up to two million …