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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.

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,

process ID and name of the function generating the error, and the error mes-

sage.

-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 depen-

dent on the value of timeout.

AUTHOR

lockd was developed by Sun Microsystems, Inc., and HP.