This is a remote procedure call (RPC) server that handles file system mount requests from remote systems and provides access control. It checks /etc/dfs/sharetab to determine which file systems are available for remote mounting and which systems are allowed to do the remote mounting. You can use two options with this command (see the mountd(1M) man page): -v and -r.
The -v option runs the command in verbose mode. Each time an NFS server determines the access a client should get, a message is printed on the console. The information generated can be useful when trying to determine why a client can not access a file system.
The -r option rejects all future mount requests from clients. This does not affect clients that already have a file system mounted.