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Today's server environments consist of many machines constructing clusters for distributed computing system or Storage Area Networks (SAN) for effectively processing or saving enormous data. In these kinds of server environments, backend-storages are usually the bottleneck of the overall system. But it is not enough to simply replace the devices with better ones to exploit their performance benefits. In other words, proper optimizations are needed to fully utilize their performance gains. In this work, the authors first applied a high performance device as a backend-storage to the existing SAN solution, and found that it could not utilize the low latency and high bandwidth of the device, especially in case of small sized random I/O pattern even though a high speed network is used.
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