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The Design and Implementation of the FreeBSD® Operating System, Second Edition by George V. Neville-Neil, Robert N.M. Watson, Marshall Kirk McKusick

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Chapter 11. The Network Filesystem

A commonly provided user-level service in any collection of UNIX systems is the network filesystem (NFS) that allows a set of computers connected to a network to share files. NFS provides client computers with a namespace and a set of file access semantics similar to the capabilities of a local filesystem. Providing local-filesystem semantics in a distributed system is a challenging problem. Sections 11.1 and 11.2 cover the development of NFSv2 and NFSv3. Section 11.3 describes NFSv4 which attempts to address the problems discovered in the first 25 years of deploying NFS. NFSv3 is the most widely used version in 2014, but NFSv4 is rapidly overtaking it in popularity. FreeBSD supports all three versions of NFS. ...

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