Setting block timeout
If a user requests a lock that already exists, the request is
blocked (refused). Most locks exist only briefly.
block_timeout is the interval that lockd will wait
before retransmitting a blocked request to the server lockd.
By default, lockd will wait 5 seconds before retransmitting
the lock request. You can alter this by setting the -b flag
when you invoke lockd on the client:
/etc/lockd -b 30
This will cause the local lockd to wait 30 seconds before retransmitting a blocked lock request to the server. It is generally desirable to change the block_timeout when you wish to minimize network traffic or if you are transmitting to a slow server.