中文摘要：

随着海量数据存储和I/O密集型应用的发展，I/O越发成为了分布式存储系统的性能瓶颈，分布式文件系统是解决I/O瓶颈问题的重要途径。如何系统地研究分布式文件系统的性能因子和优化方案，是一个重要研究课题。本文系统地阐述了分布式文件系统的性能研究现状，挖掘并分析了分布式文件系统的关键性能影响因子，为分布式文件系统的设计和性能优化研究提供支持。

英文摘要：

With the development of mass data storage and I/O intensive applications , I/O increasingly becomes the perform-ance bottleneck of distributed storage system and the distributed file system is the important way to solve the problem of I /O bottle-neck.How to systematically study the performance factor and optimize scheme of the distributed file system is an important research topic.This paper systematically elaborates the referred performance research of the distributed file system , analyzing the key per-formance impact factors of the distributed file system , and providing the design and performance optimization research of distributed file system.