It forwards fcntl(2) locking requests for NFS mounted file systems to the lock manager on the NFS server.
It generates local file locking operations in response to requests forwarded from lock managers running on NFS client machines.
State information kept by the lock manager about these locking requests can be lost if the lockd is killed or the operating system is rebooted. Some of this information can be recovered as follows. When the server lock manager restarts, it waits for a grace period for all client-site
lock managers to submit reclaim requests. Client-site lock managers, on the other hand, are notified by the status monitor daemon, statd(1M), of the restart and promptly resubmit previously
granted lock requests. If the lock daemon fails to secure a previously granted lock at the server site, then it sends
SIGLOST to a process.
Administrators wanting to change startup parameters for lockd should, as root, make changes in the /etc/default/nfs file rather than editing the /etc/init.d/nfs.client file. See nfs(4).
The following options are supported:
Specify the number of seconds that clients have to reclaim locks after the server reboots. The default is 45 seconds. Equivalent of the LOCKD_GRACE_PERIOD parameter in the nfs file.
Specify the listener backlog (listen_min_backlog). listen_min_backlog is the number connect requests that are queued and waiting to be processed before new connect requests start to get dropped.
Specify the number of seconds to wait before retransmitting a lock request to the remote server. The default value is 15 seconds. Equivalent of the LOCKD_RETRANSMIT_TIMEOUT parameter in the nfs file.
Specify the maximum number of concurrent threads that the server can handle. This concurrency is achieved by up to nthreads threads created as needed in the kernel. nthreads should be based on the load expected on this server. If nthreads is not specified, the maximum number of concurrent threads will default to 20. Equivalent of the LOCKD_SERVERS parameter in the nfs file.
See attributes(5) for descriptions of the following attributes:
|ATTRIBUTE TYPE||ATTRIBUTE VALUE|