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FAST '03 Abstract

Modeling Hard-Disk Power Consumption

John Zedlewski, Sumeet Sobti, Nitin Garg, and Fengzhou Zheng, Princeton University; Arvind Krishnamurthy, Yale University; and Randolph Wang, Princeton University


Excessive power consumption is a major barrier to the market acceptance of hard disks in mobile electronic devices. Studying and reducing power consumption, however, often involves running time-intensive disk traces on real hardware with specialized power-monitoring equipment. This paper presents Dempsey, a disk simulation environment that includes accurate modeling of disk power consumption. It includes tools to automatically extract performance and power consumption parameters from a given disk drive, without needing detailed specifications from the manufacturer. The tools use stimulus-based measurements to extract these parameters. Dempsey is experimentally validated for two mobile hard disks, namely, the 1 GB IBM Microdrive and the 5 GB Toshiba Type II PC Card HDD. In the worst observed case, Dempsey's estimate of power consumption differs from the measured consumption by 7.5%. This demonstrates that disk power consumption can be simulated both efficiently and accurately.
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Last changed: 7 Nov. 2003 jel
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