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USENIX 2003 Annual Technical Conference, General Track — Abstract
Pp. 297-310 of the Proceedings

Robust, Portable I/O Scheduling with the Disk Mimic

Florentina I. Popovici, Andrea C. Arpaci-Dusseau, and Remzi H. Arpaci-Dusseau University of Wisconsin, Madison


We propose a new approach for I/O scheduling that performs on-line simulation of the underlying disk. When simulation is integrated within a system, three key challenges must be addressed: first, the simulator must be portable across the full range of devices; second, all configuration must be automatic; third, the computation and memory overheads must be low. Our simulator, the Disk Mimic, achieves these goals by building a table-based model of the disk as it observes the times for previous requests. We show that a shortest-mimicked-time-first (SMTF) scheduler performs nearly as well as an approach with perfect knowledge of the underlying device and that it is superior to traditional scheduling algorithms such as C-LOOK and SSTF; our results hold as the seek and rotational characteristics of the disk are varied.
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Last changed: 7 Nov. 2003 jel
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