As one of the core components of NSS, distributed file systems should be paid much attention to. 作为网络存储系统关键部件，分布式文件系统的研究具有非常重要的意义。
DFS is a file system whose clients, servers, and storage devices are dispersed among the machines of a distributed system. 分布式文件系统是客户端，服务器，存储设备分散在不同机器的文件系统。
