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On-line extraction of SCSI disk drive parameters

1995; Association for Computing Machinery; Volume: 23; Issue: 1 Linguagem: Inglês

10.1145/223586.223604

1557-9484

Bruce Worthington, Gregory R. Ganger, Yale N. Patt, John Wilkes,

Parallel Computing and Optimization Techniques

Sophisticated disk scheduling algorithms require accurate, detailed disk drive specifications, including data about mechanical delays, on-board caching and prefetching algorithms, command and protocol overheads, and logical-to-physical block mappings. Comprehensive disk models used in storage subsystem design require similar levels of detail. We describe a suite of general-purpose algorithms and techniques for acquiring the necessary information from a SCSI disk drive. Using only the ANSI-standard interface, we demonstrate how the important parameter values of a modern SCSI drive can be determined accurately and efficiently.