S. Misbahuddin, N. Al-Holou, and S.T. Khan
Availability, modelling, Markov models, fault tolerant computing,multicomputer systems, performance modelling
Multicomputers are distributed memory systems in which inde- pendent computers are connected with each other by a network. Multicomputers are widely used in business and scientific applica- tions. Due to their flexibility, scalability, and cost performance, multicomputer systems are considered preferable to multiprocessor systems. They are also gaining attraction in the area of Internet- based computing, in which delays or interruptions in client–server interactions may be equally costly to service providers and cus- tomers. Multicomputer systems attributed with high available (HA) solutions may be used to withstand service unavailability due to the web servers’ failures. In this paper we investigate a Markov model-based approach to estimate the availability of multicomputer systems with and without HA. The availability is computed as a function of server failure rate and the number of surviving servers. This model can estimate the number of nodes needed for a required availability measure.
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