Analysis of pNFS

pNFS client through the layout file to control the layout driver ，and the layout driver controls the I/O driver ，then the I/O driver gives back a I/O reply to the client。

pNFS server sends a control flow to the storage system ，then the storage system gets the layout structure file form the storage nodes and gives the layout file to the client。

There are 3 main parts in a pNFS：client server and storage nodes。client is used by user ，server is the connection between client and storage nodes。