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Availability analysis of a distributed system with homogeneity in client and server under four different maintenance options

机译：分布式系统的可用性分析同质性在客户机和服务器四个不同的维护选项

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Abstract System availability is a major performance in distributed system design and analysis. For reliability evaluation and system performance, this study analyzed a distributed system consisting of two hosts (clients) connected to two servers via a load balancer. The system is configured as series–parallel system consisting of three subsystems A, B and C. Subsystem A consists of two clients working in parallel with each other, subsystem B has two active parallel servers, while subsystem C consists of a load balancer. Clients, Servers and LD balancer failure and repair time are to be exponentially distributed. The system is under four different maintenance models: Model 1 is the system with perfect repair and replacement at total failure, Model 2 is repairable system with minimal repair at failure, Model 3 is the system with replacement at total failure and online preventive maintenance (PM) at partial failure and Model 4 is fault-tolerant system with replacement at total failure. The system is analyzed using first-order differential difference equations to derive the expressions for availability. The model is implemented using Java programming language. To make the computation and analysis of systems availability more efficient, numerical examples are presented to illustrate the performance of the model. Impact of both clients and server’s failure and repair rates on availability is determined and presented in figures and graphs. The analysis of the results obtained with respect to the availability indicates that systems which are fault tolerant perform best and have the highest availability.
机译：抽象的系统可用性是一个主要的在分布式系统设计和性能分析。性能,本研究分析了分布式两个主机组成的系统(客户端)通过负载平衡器连接到两台服务器。系统配置为串并联系统由三个子系统组成的A、B和C。子系统包括两个客户的工作B有两个相互平行,子系统活动并行服务器,而子系统C由一个负载均衡器。LD均衡器失败和修理时间指数分布。四个不同的维修模型:模型1系统与完美的修理和更换总失败,2是可修系统模型最小修复失败,模型3是一个系统在彻底失败的接替者和在线预防性维修(PM)在部分失败和模型4是容错系统替换在彻底失败。分析了用一阶微分差分方程推导出的表达式的可用性。Java编程语言。计算和分析的系统可用性更有效率,数值例子说明模型的性能。客户端和服务器的失败和的影响修复率可用性和决定提出了数字和图表。获得的结果的表明系统的可用性容错执行最好的和最高可用性。

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