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SunOS man pages : lockd (1)

Maintenance Commands                                    lockd(1M)


lockd - network lock daemon


/usr/lib/nfs/lockd [ -g graceperiod ] [ -t timeout ] [ nthreads ]


The lockd utility is part of the NFS lock manager, which supports record locking operations on NFS files. See fcntl(2) and lockf(3C). The lock manager provides two func- tions: o it forwards fcntl(2) locking requests for NFS mounted file systems to the lock manager on the NFS server o 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 lock- ing 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 res- tarts, 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 mon- itor 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.


-g graceperiod Specify the number of seconds that clients have to reclaim locks after the server reboots. The default is 45 seconds. -t timeout Specify the number of seconds to wait before retransmitting a lock request to the remote server. The default value is 15 seconds. nthreads 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 ker- nel. 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. SunOS 5.8 Last change: 12 Feb 1997 1 Maintenance Commands lockd(1M)


See attributes(5) for descriptions of the following attri- butes: ____________________________________________________________ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | |_____________________________|_____________________________| | Availability | SUNWcsu | |_____________________________|_____________________________|


statd(1M), fcntl(2), lockf(3C), attributes(5) SunOS 5.8 Last change: 12 Feb 1997 2