Optimal configuration of M-for-N shared spare-server systems. (2019)

• Record Type: Journal Article
• Authors: Ozaki, Hirokazu
• Is Part Of: International journal of information and communication technology. Volume 14:Number 2(2019)
• Page Start: 218
• Page End: 235
• Publication Date: 2019
• Subjects: cloud computing -- user-perceived reliability -- shared protection systems -- probability distribution -- availability -- optimal configuration -- spare-server; Information technology -- Periodicals; Computer science -- Periodicals; Telecommunication -- Periodicals; 004.05
• Languages: English
• ISSNs: 1466-6642

Abstract

In this study, we investigate the user-perceived availability of M -for- N shared spare-server systems. We assume that there are N identical working servers, each serving a single user group, and M identical shared spare servers in the system. We also assume that the time to failure of the server is subject to an exponential distribution, and the time needed to repair a failed server is subject to the Erlang type- k distributions. Under these assumptions, our numerical computation shows that there exists an optimal size ( M + N ) for shared spare-server systems with respect to the availability and cost for a given condition.