In addition , a cds server determines the method of file caching based on the states of web servers and file accessing with the objective of using the system resource more efficiently 系统通过后端的cds服务器( clusterdecisionserver ,集群决策服务器) ,根据所收集到的各web服务器的资源状况与文件访问状况,统一确定文件的缓存策略,以达到系统资源的合理使用。