NAME [Toc] [Back]
lockd - network lock daemon
SYNOPSIS [Toc] [Back]
/usr/sbin/rpc.lockd [-l log_file] [-t timeout] [-g graceperiod]
DESCRIPTION [Toc] [Back]
lockd is an RPC server that processes NFS file locking requests from
the local kernel or from another remote lock daemon. lockd forwards
lock requests for remote data to the server site's lock daemon through
the RPC/XDR package (see rpc(3N)). lockd then requests the status
monitor daemon, statd for monitor service (see statd(1M)). The reply
to the lock request is not sent to the kernel until the status daemon
and the server site's lock daemon have replied.
If either the status monitor or server site's lock daemon is
unavailable, the reply to a lock request for remote data is delayed
until all daemons become available.
When a server recovers, it waits for a grace period for all NFS
client-site lockds to submit reclaim requests. Client-site lockds are
notified by the statd of the server recovery, and promptly resubmit
previously granted lock requests. If a lockd fails to secure a
previously granted lock at the server site, the lockd sends a SIGLOST
to the process holding that lock.
Options [Toc] [Back]
lockd recognizes the following options and command-line arguments:
-l log_file Log any errors to the named log file
log_file. Errors are not logged if the -l
option is not specified.
Information logged to the file includes date
and time of the error, host name, process ID
and name of the function generating the
error, and the error message.
-t timeout lockd uses timeout (seconds) as the interval
instead of the default value (10 seconds) to
retransmit a lock request to the remote
server. Note that changing this value also
changes the value for grace period duration.
-g graceperiod lockd uses [1+(graceperiod/timeout)]xtimeout
(seconds) as the grace period duration
instead of the default value (5xtimeout
seconds). If both -t and -g are specified,
the -t should appear first since the grace
period duration is dependent on the value of
Hewlett-Packard Company - 1 - HP-UX 11i Version 2: August 2003
AUTHOR [Toc] [Back]
lockd was developed by Sun Microsystems, Inc., and HP.
SEE ALSO [Toc] [Back]
fcntl(2), lockf(2), signal(2), statd(1M).
Hewlett-Packard Company - 2 - HP-UX 11i Version 2: August 2003 [ Back ]