svcadm(8)을 검색하려면 섹션에서 8 을 선택하고, 맨 페이지 이름에 svcadm을 입력하고 검색을 누른다.
lockd(8)
lockd(8) System Administration Commands lockd(8)
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 in NFSv2 and NFSv3. 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 daemon, statd(8), 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
using the sharectl(8) command.
SMF Management
The lockd service is managed by the service management facility,
smf(7), 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(8). The service's
status can be queried using the svcs(1) command.
If it is disabled, it will be enabled by mount_nfs(8), share_nfs(8),
and automountd(8) unless its application/auto_enable property is set to
false.
The sharectl(8) command is used to manipulate the startup SMF parame‐
ters for lockd. Currently supported parameters are as follows:
lockd_listen_backlog=num
Set connection queue length for lockd over a connection-oriented
transport. The default and minimum value is 32. Equivalent to -l
option.
lockd_servers=num
Maximum number of concurrent lockd requests. The default is 1024.
Equivalent to the nthreads operand.
lockd_retransmit_timeout=num
Retransmit timeout, in seconds, before lockd retries. The default
is 5. Equivalent to -t option.
grace_period=num
Grace period, in seconds, that all clients (both NLM and NFSv4)
have to reclaim locks after a server reboot. This parameter also
controls the NFSv4 lease interval. The default is 90. Equivalent to
-g option.
See EXAMPLES, below.
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 grace_period property described above.
-l listen_min_backlog
Specify the listener backlog (listen_min_backlog). listen_min_back‐
log is the number connect requests that are queued and waiting to
be processed before new connect requests start to get dropped.
Equivalent of the lockd_listen_backlog property described above.
-t timeout
Specify the number of seconds to wait before retransmitting a lock
request to the remote server. The default value is 5 seconds.
Equivalent of the lockd_retransmit_timeout property described
above.
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 1024. Equiva‐
lent of the lockd_servers property described above.
EXAMPLES
Example 1 Setting a lockd Property
The following command sets lockd_listen_backlog to a new value:
# sharectl set -p lockd_listen_backlog=40 nfs
The lockd_listen_backlog and other lockd properties are described under
NOTES, below.
Example 2 Getting a lockd Property Value
The following command retrieves the value of the lockd_listen_backlog
property.
% sharectl get -p lockd_listen_backlog nfs
lockd_listen_backlog=40
ATTRIBUTES
See attributes(7) for descriptions of the following attributes:
tab() box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) ATTRIBUTE TYPEAT‐
TRIBUTE VALUE _ Availabilitysystem/file-system/nfs
SEE ALSO
svcs(1), fcntl(2), lockf(3C), attributes(7), smf(7), automountd(8),
clear_locks(8), mount_nfs(8), share(8), share_nfs(8), sharectl(8),
statd(8), svcadm(8)
NOTES
The lockd daemon does not need to be running for NFSv4.
The lockd daemon might not exist in a future release of Solaris.
Oracle Solaris 11.4 3 Nov 2021 lockd(8)