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2008

Exploiting In-Memory and On-Disk Redundancy to Conserve Energy in Storage Systems

10 years 4 months ago
Exploiting In-Memory and On-Disk Redundancy to Conserve Energy in Storage Systems
Abstract--Today's storage systems place an imperative demand on energy efficiency. A storage system often places single-rotationrate disks into standby mode by stopping them from spinning to conserve energy when the workload is not heavy. The major obstacle of this method is a high spin-up cost introduced by passively waking up the standby disk to service requests. In this paper, we propose a redundancy-based hierarchical I/O cache architecture called RIMAC to solve the problem. The idea of RIMAC is to enable data on the standby disk(s) to be recovered by accessing a two-level I/O cache and/or active disks if needed. In parity-based redundant disk arrays, RIMAC exploits parity redundancy to dynamically XOR-reconstruct the data being accessed toward standby disk(s) at both the cache and disk levels. By avoiding passive spin-ups, RIMAC can significantly improve both energy efficiency and performance. In RIMAC, we developed 1) two power-aware read request transformation schemes calle...
Jun Wang, Xiaoyu Yao, Huijun Zhu
Added 15 Dec 2010
Updated 15 Dec 2010
Type Journal
Year 2008
Where TC
Authors Jun Wang, Xiaoyu Yao, Huijun Zhu
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