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Issue No. 01 - January (2011 vol. 60)
ISSN: 0018-9340
pp: 64-79
Suzhen Wu , Huazhong University of Science and Technology, Wuhan and Xiamen University, Xiamen
Hong Jiang , University of Nebraska-Lincoln, Lincoln
Dan Feng , Huazhong University of Science and Technology, Wuhan
Lei Tian , Huazhong University of Science and Technology, Wuhan and University of Nebraska-Lincoln, Lincoln
Bo Mao , Huazhong University of Science and Technology, Wuhan
Due to the contention for the shared disk bandwidth, the user I/O intensity can significantly impact the performance of the online low-priority background tasks, thus reducing the reliability and availability of RAID-structured storage systems. In this paper, we propose a novel and practical scheme, called WorkOut (I/O Workload Outsourcing), to significantly boost the performance of those low-priority background tasks. WorkOut effectively outsources all write requests and popular read requests originally targeted at the degraded RAID set that is performing the low-priority background tasks to a surrogate RAID set. The lightweight prototype implementation of WorkOut and extensive trace-driven and benchmark-driven experiments on two case studies demonstrate that, compared with existing approaches, WorkOut effectively improves the performance of the low-priority background tasks, such as RAID reconstruction and RAID resynchronization. Importantly, WorkOut is portable and can be easily incorporated into any existing optimizing algorithms for RAID-structured storage systems.
Low-priority background tasks, RAID reconstruction, reliability, availability, performance evaluation.

D. Feng, H. Jiang, S. Wu, L. Tian and B. Mao, "Improving Availability of RAID-Structured Storage Systems by Workload Outsourcing," in IEEE Transactions on Computers, vol. 60, no. , pp. 64-79, 2010.
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