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Issue No. 06 - June (2016 vol. 65)
ISSN: 0018-9340
pp: 1692-1705
Wen Xia , , School of Computer Science and Technology, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, HuBei, China
Hong Jiang , Department of Computer Science and Engineering, University of Nebraska-Lincoln, 217 Schorr Center, 1101 T Street, Lincoln, NE
Dan Feng , Wuhan National Laboratory for Optoelectronics, School of Computer Science and Technology, Huazhong University of Science and Technology, Wuhan, HuBei, China
Lei Tian , Tintri, Mountain View, CA
Data reduction has become increasingly important in storage systems due to the explosive growth of digital data in the world that has ushered in the big data era. One of the main challenges facing large-scale data reduction is how to maximally detect and eliminate redundancy at very low overheads. In this paper, we present DARE, a low-overhead deduplication-aware resemblance detection and elimination scheme that effectively exploits existing duplicate-adjacency information for highly efficient resemblance detection in data deduplication based backup/archiving storage systems. The main idea behind DARE is to employ a scheme, call Duplicate-Adjacency based Resemblance Detection (DupAdj), by considering any two data chunks to be similar (i.e., candidates for delta compression) if their respective adjacent data chunks are duplicate in a deduplication system, and then further enhance the resemblance detection efficiency by an improved super-feature approach. Our experimental results based on real-world and synthetic backup datasets show that DARE only consumes about 1/4 and 1/2 respectively of the computation and indexing overheads required by the traditional super-feature approaches while detecting 2-10 percent more redundancy and achieving a higher throughput, by exploiting existing duplicate-adjacency information for resemblance detection and finding the “sweet spot” for the super-feature approach.
Redundancy, Indexing, Feature extraction, Random access memory, Data structures, Throughput

W. Xia, H. Jiang, D. Feng and L. Tian, "DARE: A Deduplication-Aware Resemblance Detection and Elimination Scheme for Data Reduction with Low Overheads," in IEEE Transactions on Computers, vol. 65, no. 6, pp. 1692-1705, 2016.
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