Abstract: Beginning with the problems of solving the I/O bottleneck of high performance computer．First,this paper mainly analyzed and designed the architecture,access mechanism,management mechanism and operating mechanism of parallel network file system-PNFS．Second,we made the test of PNFS,and the results show that PNFS can resolve the problems of traditional file systems about scalability,availability and performance and provides an effective method for building high performance file system.

Key words: PNFS,Layout,Network-storage,Performance evaluation