Real-time disk scheduling techniques for mirrored disk systems

Author

Park, Hyang Jae ; Shin, Heonshik

Author_Institution

Dept. of Comput. Sci., Keimyung Univ., Taegu, South Korea

fYear

1994

fDate

22-26 Aug 1994

Firstpage

474

Abstract

Mirrored disk systems are currently used for enhancing reliability of disk systems as well as achieving speedup of read/write access time. These characteristics of disk mirroring can properly meet the requirements of real time applications. The paper aims to develop some techniques for management of read request queues in a mirrored disk system operating under a soft real time environment, and conduct performance comparisons between them through simulations. The simulation results show that centralized queue policies out-perform distributed queue policies, and that some improved delayed write policies can reduce the miss ratio of read requests. Finally, we suggest two improved centralized queue policies which utilize multiple delayed write queues

Keywords

magnetic disc storage; queueing theory; real-time systems; scheduling; storage management; centralized queue policies; delayed write policies; delayed write queues; distributed queue policies; mirrored disk systems; miss ratio; performance comparisons; read request queues; read/write access time; real time applications; real-time disk scheduling techniques; soft real time environment; Actuators; Coils; Computer science; Delay effects; Environmental management; Processor scheduling; Real time systems; Reliability engineering; Scheduling algorithm; Timing;

fLanguage

English

Publisher

ieee

Conference_Titel

TENCON '94. IEEE Region 10's Ninth Annual International Conference. Theme: Frontiers of Computer Technology. Proceedings of 1994

Print_ISBN

0-7803-1862-5

Type

conf

DOI

10.1109/TENCON.1994.369255

Filename

369255