This article is from the storage FAQ part2, by Rodney D. Van Meter with numerous contributions by others.
The Network File System, originally developed by Sun Microsystems and now pretty standard in the Unix world, and clients exist for PC, Mac, VMS, and other non-Unix OSes. V2, the common version, supports single files only up to 2^32 (4GB) bytes. I'm not sure if there are any limits to a file system size under NFS, other than those imposed by the client and server OSes (SHMO). NFS is defined in RFC 1094 (http://www.cis.ohio-state.edu/rfc/rfc1094.txt). V3 is now RFC 1813 (http://www.cis.ohio-state.edu/rfc/rfc1813.txt). There is at least one newsgroup devoted specifically to NFS: comp.protocols.nfs.
 
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