HP-UX Reference (11i v2 07/12) - 1M System Administration Commands A-M (vol 3)

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lockd(1M) lockd(1M)
NAME
lockd, rpc.lockd - network lock daemon
SYNOPSIS
/usr/sbin/rpc.lockd
[-l log_file][
-t timeout][-g graceperiod]
DESCRIPTION
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 pre-
viously 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.
A fixed port can be specified for lockd by using the LOCKD_PORT variable in the
/etc/rc.config.d/nfsconf
file, as shown:
LOCKD_PORT =port_number
The port number can have any value between 1 and 65535. After adding the port variable to the
/etc/rc.config.d/nfsconf
file, lockd must be restarted for this to take effect. This feature can
be disabled by deleting or commenting out the port variable from the
/etc/rc.config.d/nfsconf
file and restarting lockd.
Options
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, pro-
cess 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 )]× timeout (seconds) as the grace period
duration instead of the default value ( 5×timeout seconds). If both -t and -g are
specified, the
-t should appear first since the grace period duration is dependent
on the value of timeout.
WARNINGS
The LOCKD_PORT variable will be obsoleted in HP-UX 11i V3, and lockd will use 4045 as a hard coded
fixed port. For this reason, HP recommends using 4045 for LOCKD_PORT .
AUTHOR
lockd was developed by Sun Microsystems, Inc., and HP.
SEE ALSO
statd(1M), fcntl(2), lockf(2), signal(2).
HP-UX 11i Version 2: December 2007 Update − 1 − Hewlett-Packard Company 505