DocumentCode
1935208
Title
Arm scheduling in shadowed disks
Author
Bitton, D.
Author_Institution
Dept. of Electr. Eng. & Comput. Sci. Illinois Univ., Chicago, IL, USA
fYear
1989
fDate
Feb. 27 1989-March 3 1989
Firstpage
132
Lastpage
136
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;
fLanguage
English
Publisher
ieee
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
Type
conf
DOI
10.1109/CMPCON.1989.301915
Filename
301915
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