Title :
Arm scheduling in shadowed disks
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci. Illinois Univ., Chicago, IL, USA
fDate :
Feb. 27 1989-March 3 1989
Abstract :
The author describes a number of configurations and disk scheduling algorithms for shadow sets, and presents an analysis of seek time based on both a simulation and an analytic model. She focuses on the algorithm based on assigning a read request to the arm that is within the shortest seek distance of the target location. With this scheduling algorithm, shadowing five disks decreases the expected seek time for reads by 50%. For a ratio of reads to writes equal to 1.5 or higher, shadowing decreases the overall seek time by 20%.<>
Keywords :
magnetic disc storage; scheduling; analytic model; arm scheduling; disk scheduling algorithms; shadow sets; shadowed disks; simulation; Algorithm design and analysis; Analytical models; Arm; Availability; Control systems; Disk drives; Maintenance; Processor scheduling; Scheduling algorithm; Shadow mapping;
Conference_Titel :
COMPCON Spring '89. Thirty-Fourth IEEE Computer Society International Conference: Intellectual Leverage, Digest of Papers.
Conference_Location :
San Francisco, CA, USA
Print_ISBN :
0-8186-1909-0
DOI :
10.1109/CMPCON.1989.301915
