【摘要】 为了吸引更多的用户使用云存储以获得更大的经济效益,云提供商为潜在用户提供免费体验,为收费用户提供质量更高的存储服务。融合免费服务和收费服务给出一种云存储架构,考虑潜在用户的不耐烦行为和收费用户源有限,建立双队列多服务台排队模型。采用稳态解析法,导出系统中潜在用户和收费用户的平均时延的性能表达式,并通过系统实验揭示系统参数对系统性能的影响。综合用户的响应性能和云提供商的投资规模,建立系统成本函数,改进万有引力智能寻优算法,给出云服务器的部署方案,进行云存储资源的有效管理。更多还原

【Abstract】 In order to appeal more users to the cloud storage and to obtain greater economic benefits,cloud vendors offer a free experience to potential users and provide a higher quality storage service for chargeable users.By integrating free service and chargeable service,a cloud storage architecture is given.Considering impatience behavior of potential users and finite number of chargeable users,a queueing model with two cloud buffers and multiple servers is built.With the help of steady-state analysis method,the average latency of potential users and the average latency of chargeable users are derived.The influence of system parameters on system performance is investigated.Considering both the response performance of users and the investment of cloud vendors,a cost function of system is established.Through improving gravitational searching algorithm,a deployment plan of cloud servers is provided,and an effective management of cloud storage resource is presented.更多还原