What is the differrence between a distributed file system, clustered file system and a network file system ?
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The usual classification is:
A network file system is
A distribution file system is another word for a network file system. It has the advantage that it is clearer that not necessarily NFS is meant.
A cluster file system is a file system where the data is distributed on multiple machines that appear to the clients as a single storage system (a cluster). Examples are PanFS, GPFS, Lustre, and to make things more complicate pNFS (Parallel NFS).