Chapter 29 NFS Network File System

Chapter 29 NFS:Network File System

29.1 Introduction

29.2 Sum Remote Procedure Call

Most network programming is done by writing application programs that call system-provided functions to perform specific network operations.

Sun RPC

29.3 XDR: External Data Representation

29.8 Summary

29.4 Port Mapper

29.5 NFS Protocol

NFS provides transparent file access for clients to files and filesystems on a server.

File Handles

A fundamental concept in NFS is the file handle. It is an opaque object used to reference a file or directory on the server.

Mount Protocol

NFS Procedures

UDP or TCP?

NFS Over TCP

The Berkeley Net/2 implementation of NFS supports either UDP or TCP.

29.6 NFS Examples

Let's use tcpdump to see which NFS procedures are invoked by the client for typical file operations.

Simple Example: Reading a File

Simple Example: Creating a Directory

Statelessness

Example: Server Crash

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29.7 NFS Version 3