I often times hear these three distinct DFSs used to mean one in the same. This presentation does a nice job of describe how they are different and how they are the same:
http://lvee.org/uploads/image_upload/file/273/savchenko-distributed-fs.pdf
Network File System: A single server (or at least an appearance) and multiple network clients.
Examples: NFS, CIFS
Clustered File System:Servers sharing the same local storage (usually SAN at block level)shared storage architecture.
Examples: GFS2, OCFS2
Distributed file system : “Shared nothing” model, independent servers. intelligent server architecture.
Examples: pNFS, AFS
http://lvee.org/uploads/image_upload/file/273/savchenko-distributed-fs.pdf
Network File System: A single server (or at least an appearance) and multiple network clients.
Examples: NFS, CIFS
Clustered File System:Servers sharing the same local storage (usually SAN at block level)shared storage architecture.
Examples: GFS2, OCFS2
Distributed file system : “Shared nothing” model, independent servers. intelligent server architecture.
Examples: pNFS, AFS
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