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Title: A model for availability analysis of distributed software/hardware systems
Authors: Lai, C.D.
Xie, M. 
Poh, K.L. 
Dai, Y.S.
Yang, P.
Keywords: Clustered system
Combined software/hardware
Distributed system
Markov model
Software/hardware reliability
System availability
Issue Date: 15-Apr-2002
Citation: Lai, C.D., Xie, M., Poh, K.L., Dai, Y.S., Yang, P. (2002-04-15). A model for availability analysis of distributed software/hardware systems. Information and Software Technology 44 (6) : 343-350. ScholarBank@NUS Repository.
Abstract: System availability is a major performance concern in distributed systems design and analysis. A typical kind of application on distributed systems has a homogeneously distributed software/hardware structure. That is, identical copies of distributed application software run on the same type of computers. In this paper, the system availability for this type of system is studied. Such a study is useful when studying optimal testing time or testing resource allocation. We consider both the case of simple two-host system, and also the more general case of multi-host system. A Markov model is developed and equations are derived to obtain the steady-state availability. Both software and hardware failures are considered, assuming that software faults are constantly being identified and removed upon a failure. Although a specific model for software reliability is used for illustration, the approach is a general one. Comparisons show that system availability changes in a similar way to single-host based software/hardware systems. Sensitivity analysis is also presented. In addition, the assumptions used in this paper are discussed. © 2002 Elsevier Science B.V. All rights reserved.
Source Title: Information and Software Technology
ISSN: 09505849
DOI: 10.1016/S0950-5849(02)00007-1
Appears in Collections:Staff Publications

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