To improve the reliability of the system, the component can be used as parallel or redundant backup. Among them, the parallel connection mode is simple and the cost is low, but the reliability of increasing rate is small. The other one connection mode is complexity and cost is high, but the reliability is improved greatly. The actual system has many components, through the combination of the original component can produce a variety of ways of connection mode, its composition space is exponential. Every connection mode has its reliability and cost, they are a pair of contradictory goals, how to choose the best connection mode to make the reliability and economy to achieve better, in other words, how much of the number of components are choose for parallel and the number of it for redundant are the best choice? This find the optimal number of for parallel and redundant backups in the sense of Pareto, and analysis the relation between optical connection mode and time.
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