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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
Abstract
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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