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Conserving Energy in Conventional Disk based RAID Systems

Energy-efficiency is becoming increasingly important for storage systems to reduce the total cost of ownership (TCO). In this paper, we propose an energy saving policy named eRAID for conventional disk based RAID-1 systems using redundancy. In particular, we develop a dynamic performance control scheme with the help of a performance predictor based on queueing network theory. Moreover, we discuss alternative data layout schemes that are more energy-efficient than traditional disk mirroring. Experimental results show that eRAID can save up to 30% energy without violating predefined performance constraints.