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CosaFS: A Cooperative Shingle-Aware File System LINGFANG ZENG and ZEHAO ZHANG, Huazhong University of Science and Technology YANG WANG, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences DANG FENG, Huazhong University of Science and Technology KENNETH B. KENT, University of New Brunswick In this article, we design and implement a cooperative shingle-aware file system, called CosaFS, on heterogeneous storage devices that mix solid-state drives (SSDs) and shingled magnetic recording (SMR) technology to improve the overall performance of storage systems. The basic idea of CosaFS is to classify objects as hot or cold objects based on a proposed Lookahead with Recency Weight scheme. If an object is identified as a hot (small) object, then it will be served by SSD. Otherwise, cold (large) objects are stored on SMR. For an SMR, large objects can be accessed in large sequential blocks, rendering the performance of their accesses comparable with that of accessing the same large sequential blocks as if they were stored on a hard drive. Small objects, such as inodes and directories, are stored on the SSD where seeks for such objects are nearly free. With thorough empirical studies, we demonstrate that CosaFS, as a cooperative shingle-aware
ACM Transactions on Storage (TOS) – Association for Computing Machinery
Published: Nov 17, 2017
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