JZUS - Journal of Zhejiang University SCIENCE

Journal of Zhejiang University SCIENCE C 2012 Vol.13 No.11 P.799-815

http://doi.org/10.1631/jzus.C1200085

Strip-oriented asynchronous prefetching for parallel disk systems

Author(s): Yang Liu, Jian-zhong Huang, Xiao-dong Shi, Qiang Cao, Chang-sheng Xie
Affiliation(s): Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China; more
Corresponding email(s): yangl.hust@gmail.com, husthjz@mail.hust.edu.cn, shixd@mail.hust.edu.cn, caoqiang@mail.hust.edu.cn, cs_xie@mail.hust.edu.cn
Key Words: Parallel disk system, Strip, Sequential prefetching, Asynchronous scheduling

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Abstract: sequential prefetching schemes are widely employed in storage servers to mask disk latency and improve system throughput. However, existing schemes cannot benefit parallel disk systems as expected due to the fact that they ignore the distinct internal characteristics of the parallel disk system, in particular, data striping. Moreover, their aggressive prefetching pattern suffers from premature evictions and prolonged request latencies. In this paper, we propose a strip-oriented asynchronous prefetching (SoAP) technique, which is dedicated to the parallel disk system. It settles the above-mentioned problems by providing multiple novel features, e.g., enhanced prediction accuracy, adaptive prefetching strength, physical data layout awareness, and timely prefetching. To validate SoAP, we implement a prototype by modifying the software redundant arrays of inexpensive disks (RAID) under Linux. Experimental results demonstrate that SoAP can consistently offer improved average response time and throughput to the parallel disk system under non-random workloads compared with STEP, SP, ASP, and Linux-like SEQPs.

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