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6. Appendix II: Lock manager protocol Connected: An Internet Encyclopedia
6. Appendix II: Lock manager protocol

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6. Appendix II: Lock manager protocol

6. Appendix II: Lock manager protocol

Because the NFS version 2 protocol as well as the NFS version 3 protocol is stateless, an additional Network Lock Manager (NLM) protocol is required to support locking of NFS-mounted files. The NLM version 3 protocol, which is used with the NFS version 2 protocol, is documented in [X/OpenNFS].

Some of the changes in the NFS version 3 protocol require a new version of the NLM protocol. This new protocol is the NLM version 4 protocol. The following table summarizes the correspondence between versions of the NFS protocol and NLM protocol.

       NFS and NLM protocol compatibility

               +---------+---------+
               |   NFS   |   NLM   |
               | Version | Version |
               +===================+
               |    2    |   1,3   |
               +---------+---------+
               |    3    |    4    |
               +---------+---------+

This appendix only discusses the differences between the NLM version 3 protocol and the NLM version 4 protocol. As in the NFS version 3 protocol, almost all the names in the NLM version 4 protocol have been changed to include a version number. This appendix does not discuss changes that consist solely of a name change.


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Connected: An Internet Encyclopedia
6. Appendix II: Lock manager protocol

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