Stateless vs stateful |
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- Nonsense, Winifred. An elephant never forgets. |
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- NFSv4 introduces 2 new operations: OPEN and CLOSE
- Previous versions had the LOOKUP procedure but were stateless
- The introduction of these stateful operation permits:
- Atomicity of share reservations (needed for Windows file sharing and locking semantic)
- Aggressive client caching and delegation
- Unique 64-bit IDs for clients are used to detect reboots and reset the state (i.e. preventing stale locks)
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The NFS Version 4 Protocol
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