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Lazy Exact Deduplication JINGWEI MA, REBECCA J. STONES, YUXIANG MA, JINGUI WANG, JUNJIE REN, GANG WANG, and XIAOGUANG LIU, College of Computer and Control Engineering, Nankai University Deduplication aims to reduce duplicate data in storage systems by removing redundant copies of data blocks, which are compared to one another using fingerprints. However, repeated on-disk fingerprint lookups lead to high disk traffic, which results in a bottleneck. In this article, we propose a "lazy" data deduplication method, which buffers incoming fingerprints that are used to perform on-disk lookups in batches, with the aim of improving subsequent prefetching. In deduplication in general, prefetching is used to improve the cache hit rate by exploiting locality within the incoming fingerprint stream. For lazy deduplication, we design a buffering strategy that preserves locality in order to facilitate prefetching. Furthermore, as the proportion of deduplication time spent on I/O decreases, the proportion spent on fingerprint calculation and chunking increases. Thus, we also utilize parallel approaches (utilizing multiple CPU cores and a graphics processing unit) to further improve the overall performance. Experimental results indicate that the lazy method improves fingerprint identification performance by over 50% compared with an "eager" method with the same data layout.
ACM Transactions on Storage (TOS) – Association for Computing Machinery
Published: Jun 10, 2017
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