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Statd is an addon to NFS. NFS is inherently "stateless", which means that both clients and servers can crash and when rebooted, continue communicating as if nothing happened. A program exits when using lockd, which allows a client program to exclusively "lock" access to a file for a small time. If the client crashes, then this program is locked for all eternity. The statd program allows such locks to be registered, so that when the client/server that crashed can notify everyone else about these locks when it boots up again.
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