![]() ![]() You need to run this lock manager daemon on BOTH the client and the server for lock management to work. The lock manager is typically implemented completely inside user space in a lock manager daemon that daemon will receive messages from the NFS client when a lock is requested, and will send NLM requests to the NLM server on the NFS server machine, and will receive NLM requests from NFS clients of the machine on which it's running and will make local locking calls on behalf of those clients. This protocol is closely tied with the NFS protocol itself since it shares the file handle data structure with NFS, with the NSM protocol which the lock manager uses to recover from peer restarts, and, on some platforms the KLM protocol which is used to communicate between the NFS client code in the kernel and the user space lock manager. The purpose of the NLM protocol is to provide something similar to POSIX advisory file locking semantics to NFS version 2 and 3. ![]()
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