Proceedings of the ACM Sigmetrics Conference, May 1995.
OnLine Extraction of SCSI Disk Drive Parameters
Bruce L. Worthington, Gregory R. Ganger, Yale N. Patt, John Wilkes*
Dept. of EECS, Univ. of Michigan
Sophisticated disk scheduling algorithms require accuate, detailed disk drive specifications, including data about mechanical delays, onboard caching and prefetching algorithms, command and protocol overheads, and logicaltophysical block mappings. Comprehensive disk models used in storage subsystem design require similar levels of detail. We describe a suite of generalpurpose algorithms and techniques for acquiring the necessary information from a SCSI disk drive. Using only the ANSIstandard interface, we demonstrate how the important parameter values of a modern SCSI drive can be determined accurately and efficiently.