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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 fol-
lowing 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 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.
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.
SunOS 5.10 Last change: 17 Nov 2004 1
System Administration Commands lockd(1M)
-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 con-
current 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 attri-
butes:
____________________________________________________________
| 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)
SunOS 5.10 Last change: 17 Nov 2004 2
System Administration Commands lockd(1M)
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 service'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 property is set to false.
This daemon might not exist in a future release of Solaris.
SunOS 5.10 Last change: 17 Nov 2004 3
Man(1) output converted with
man2html and wrapped by fishsponge
This page was generated on Wed Sep 12 11:26:09 GMT 2007
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