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Disk Response Time Measurements

Johnson, Thomas D.; Jonathan, Smith; Wilson, Eric S.

This paper describes response time measurements made by inserting tracing code in the UNIX® System device driver for the Digital Equipment Corporation TM (DEC**) RA81 disks attached to a DEC UDA50 controller. The goals and methodology of the measurements are described. Detailed analysis of data derived from the measurements is provided, and some conclusions are drawn about the effect of UNIX file system mechanisms on response times as seen by user processes.

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Academic Units
Computer Science
Publisher
Department of Computer Science, Columbia University
Series
Columbia University Computer Science Technical Reports, CUCS-223-86
Published Here
October 31, 2011