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Myron Hecht, Reliability/Availability Modeling, Prediction, and Measurement
for e-Commerce and other Internet Information Systems, Proc. Reliability and Maintainability
Symposium
This paper describes the use of standard reliability modeling techniques – Markov
Modeling and Reliability Block Diagrams -- to analyze a web site and develop the
answers to strategic questions on the configuration and operation of high availability
computing systems. The analyses are performed using MEADEP,
a powerful reliability analysis tool capable of hierarchical modeling and integrating Markov and block
diagram techniques. In the example 3-tier architecture e-commerce site described
in this paper, it is shown that (a) the most frequently failing subsystem is not
necessarily the availability bottleneck, and (b) that restoration time is often
a more important parameter than availability when attempting to maximize system
throughput.
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