Semi-RAID: A reliable energy-aware RAID data layout for sequential data access

Authors:
Li Xiao; Tan Yu-An; Sun Zhizhuo
Affiliations:
Beijing Institute of Technology, School of Computer Science and Technology, 5 South Zhongguancun Street, Haidian District, 100081, China;Beijing Institute of Technology, School of Computer Science and Technology, 5 South Zhongguancun Street, Haidian District, 100081, China;Beijing Institute of Technology, School of Computer Science and Technology, 5 South Zhongguancun Street, Haidian District, 100081, China
Venue:
MSST '11 Proceedings of the 2011 IEEE 27th Symposium on Mass Storage Systems and Technologies
Year:
2011

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Cited 1

CacheRAID: An Efficient Adaptive Write Cache Policy to Conserve RAID Disk Array Energy

UCC '12 Proceedings of the 2012 IEEE/ACM Fifth International Conference on Utility and Cloud Computing

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Abstract

In this paper, we propose an alternative RAID data layout, Semi-RAID (S-RAID), for the kind of application that exhibits a sequential data access pattern. The data layout of S-RAID uses a grouping strategy that makes only part of the whole array active and puts the rest of the array into standby mode. In this way S-RAID can greatly reduce the power consumption and improve the reliability while still satisfying the I/O requirements of the application. We have shown that transforming a traditional RAID 5 into S-RAID 5 makes average mean time to failure (MTTF) 8 times as long as before, and reduces the power consumption to 74% in a 5-disk configuration. In a typical video surveillance system that has 25 disks, S-RAID may reduce the power consumption to nearly 15% in the best case. The performance of S-RAID is evaluated and proved to be sufficient for the workloads it is optimized for. Possible optimization for other workloads has also been given at the end of the paper.