Abstract: Traditional network file system can not reach the achievement of high-performance computing systems，but parallel network file system-PNFS can resolve the problems of traditional file systems about scalability，availability and performance.First，the paper introduces the architecture of PNFS.PNFS enables the separation of the metadata server and the storage server to eliminate the I/O bottleneck caused by the centralized architecture.Second，the test of PNFS is done，and then the test results are compared with NFS in the same environment.Both theoretic analysis and the test results show that PNFS provides the ability to access file data parallel，it has a relatively high I/O read/write bandwidth with low latency，and it can get the linear increases on the I/O bandwidth with the increasing number of storage servers.So PNFS can meet the I/O requirements of HPC.

摘要： 传统的网络文件系统难以满足高性能计算系统的I/O 需求，并行网络文件系统——PNFS可以有效地解决传统网络文件系统在可扩展性、可用性和性能上存在的问题。首先对PNFS的体系结构进行了设计，实现了元数据服务器与存储服务器的分离，消除了由于集中服务器结构引发的I/O瓶颈问题。然后，对PNFS的原型系统进行了性能测试，并与相同环境下NFS的测试结果进行比较与分析，结果表明PNFS能够为客户端提供并行访问文件数据的能力，有着较高的I/O读写带宽和较低的访问延迟，同时实现了客户端I/O带宽与存储服务器规模之间的线性可扩展关系，能较好地满足高性能计算中的I/O需求。