DiskGroup: Energy Efficient Disk Layout for RAID1 Systems

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Executive Summary

Energy consumption is becoming an increasingly important issue in storage systems, especially for high performance data centers and network servers. In this paper, the authors introduce a family of energy-efficient disk layouts that generalize the data mirroring of a conventional RAID1 system. The scheme called DiskGroup distributes the workload between the primary disks and secondary disks based on the characteristics of the workload. They develop an analytic model to explore the design space and compute the estimated energy savings and performance as a function of workload characteristics.

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