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 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).

OPTIONS

     The following options are supported:

     -g graceperiod
           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.

     -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 con-
           nect 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  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.
           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

     statd(1M), fcntl(2), lockf(3C), nfs(4), attributes(5)