STEP: Self-Tuning Energy-safe Predictors
Proceedings of the 6th international conference on Mobile data management
ACM Transactions on Storage (TOS)
Context-aware mechanisms for reducing interactive delays of energy management in disks
ATC'08 USENIX 2008 Annual Technical Conference on Annual Technical Conference
Optimizing energy and performance for server-class file system workloads
ACM Transactions on Storage (TOS)
Evaluating performance and energy in file system server workloads
FAST'10 Proceedings of the 8th USENIX conference on File and storage technologies
Sustainable predictive storage management: on-line grouping for energy and latency reduction
Proceedings of the 4th Annual International Conference on Systems and Storage
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Increasing efforts have been aimed towards the management of power as a critical system resource, and the disk can consume approximately a third of the power required for a typical laptop computer. Mechanisms to manage disk power have included spin-down policies and APIs to modify access workloads to be more powerfriendly. In this work we present a measurement study of disk power consumption, focusing on the potential impact of successfully optimizing disk layout or predicting future disk accesses with predictive read-ahead. We demonstrate how such strategies can allow the reduction of disk power consumption at least as well as traditional disk spin-down schemes, while avoiding the serious performance degradation that can occur from excessive spin-downs. Experimental results showed that a successful predictive disk management policy could reduce disk power consumption by over 80%, while maintaining the responsiveness of a continuously running disk. In contrast, an aggressive spin-down policy that does not attempt to optimize layout or predictively read-ahead data, would achieve the same results at the expense of increasing average delays by 2 to 4 times. Another contribution of this work involves the accuracy of the measurements, which were conducted at a level precise enough to distinguish the power consumption of drive electronics, spindle-motors, and disk arm movement.