データ更新回数によるレプリケーションの最適方策

Optimal Policy of a Replication Scheme Considering the Number of Data Update


木村充位	今泉充啓	中川覃夫
Mitsutaka Kimura	Mitsuhiro Imaizumi	Toshio Nakagawa
	愛知学泉大学	愛知工業大学

Abstract

This paper considers the problem of reliability in a server system with replication considering the number of data update. Our previous paper have formulated a model of a server system with replication that the server transmits the database content to a backup site after the number of times data update in a main site. In this paper, we derive the probability of migrating routine work to the backup site and the probability of the system down. Further, we calculate the cost effectiveness and discuss an optimal replication interval to minimize it. Finally, in asynchronous and in synchronous replications, numerical examples are given to compare the performance of them.

Keywords : Disaster, Asynchronous Replication, Synchronous Replication, Optimal Policy