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lockd(1m) [hpux man page]

lockd(1M)																 lockd(1M)

NAME
lockd: rpc.lockd - network lock daemon SYNOPSIS
graceperiod] listen_min_backlog] timeout] [nthreads] DESCRIPTION
The lockd utility is part of the NFS lock manager, which supports record lock and share lock operations on NFS files. See fcntl(2) and lockf(2). provides two functions: o It forwards locking requests for NFS mounted file systems to the lockd on the NFS server. o It generates local file locking operations in response to requests forwarded from running on NFS client machines. State information kept by the lockd about these locking requests can be lost if is killed or the operating system is rebooted. Some of this information can be recovered as follows. When a server recovers, it waits for a grace period for all NFS client-site to submit reclaim requests. Client-site is notified by the of the server recovery, and promptly resubmits previously granted lock requests. If a fails to secure a previously granted lock at the server site, then the sends a to the process holding that lock. Administrators can make changes to the startup parameters for by logging in as root and editing the file (see nfs(4)). Administra- tors can also make changes by using the command. Options recognizes the following options and command-line arguments: Deprecated in favor of the parameter in the NFS default file, which is equivalent. Specify the number of seconds that all clients (both NLM and NFSv4) have to reclaim locks after the server reboots. This option also controls the NFSv4 lease interval. The default value is 90 seconds. Specify the listener backlog, listen_min_backlog, which is the number of connect requests that are queued and waiting to be processed before new connect requests begin to get dropped. Specify the number of seconds to wait before retransmitting a lock request to the remote server. The default value is 5 seconds. Equivalent to the parameter in the NFS default file. 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 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 to the parameter in the NFS default file. Notes A directory service that provides service name data base support must have the following service entries in its database: Kernel Lock Manager logging can be enabled using By default, the variable is 0 which disables the Kernel Lock Manager logging feature. The maximum value is 9. The value determines how detailed the log messages are. AUTHOR
was developed by Sun Microsystems, Inc. and HP. SEE ALSO
clear_locks(1M), kctune(1M), setoncenv(1M), statd(1M), fcntl(2), lockf(2), signal(2), getservent(3N), nfs(4), nsswitch.conf(4), ser- vices(4). lockd(1M)

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lockd(1M)						  System Administration Commands						 lockd(1M)

NAME
lockd - network lock daemon SYNOPSIS
/usr/lib/nfs/lockd [-g graceperiod] [-l listen_min_backlog] [-t timeout] [nthreads] DESCRIPTION
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 the following two functions: 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 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 dae- mon, 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 can make changes to the startup parameters for lockd by logging in as root and editing the /etc/default/nfs file (See nfs(4)). OPTIONS
The following options are supported: -g graceperiod Deprecated in favor of GRACE_PERIOD. Specify the number of seconds that all clients (both NLM and NFSv4) have to reclaim locks after the server reboots. It also controls the NFSv4 lease interval. This option is equivalent to the LOCKD_GRACE_PERIOD parameter. -l listen_min_backlog 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. -t timeout 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. OPERANDS
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 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. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWnfscu | +-----------------------------+-----------------------------+ SEE ALSO
svcs(1), automountd(1M), clear_locks(1M), mount_nfs(1M), share(1M), share_nfs(1M), statd(1M), svcadm(1M), fcntl(2), lockf(3C), nfs(4), attributes(5), smf(5) NOTES
The lockd service is managed by the service management facility, smf(5), under the service identifier: svc:/network/nfs/nlockmgr Administrative actions on this service, such as enabling, disabling, or requesting restart, can be performed using svcadm(1M). The ser- vice's status can be queried using the svcs(1) command. If it is disabled, it will be enabled by mount_nfs(1M), share_nfs(1M), and automountd(1M) unless its application/auto_enable prop- erty is set to false. This daemon might not exist in a future release of Solaris. SunOS 5.10 17 Nov 2004 lockd(1M)
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