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174 lines
4.2 KiB
Groff
174 lines
4.2 KiB
Groff
.TH CLVMD 8 "LVM TOOLS #VERSION#" "Red Hat Inc" \" -*- nroff -*-
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.
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.SH NAME
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.
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clvmd \(em cluster LVM daemon
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.
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.SH SYNOPSIS
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.
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.ad l
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.B clvmd
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.RB [ \-C ]
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.RB [ \-d
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.RI [ value ]]
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.RB [ \-E
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.IR lock_uuid ]
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.RB [ \-f ]
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.RB [ \-h ]
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.RB [ \-I
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.IR cluster_manager ]
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.RB [ \-R ]
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.RB [ \-S ]
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.RB [ \-t
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.IR timeout ]
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.RB [ \-T
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.IR start_timeout ]
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.RB [ \-V ]
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.ad b
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.
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.SH DESCRIPTION
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.
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clvmd is the daemon that distributes LVM metadata updates around a cluster.
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It must be running on all nodes in the cluster and will give an error
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if a node in the cluster does not have this daemon running.
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.
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.SH OPTIONS
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.
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.HP
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.BR \-C
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.br
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Only valid if \fB\-d\fP is also specified.
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Tells all clvmds in a cluster to enable/disable debug logging.
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Without this switch, only the local clvmd will change its debug level to that
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given with \fB\-d\fP.
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.br
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This does not work correctly if specified on the command-line that starts clvmd.
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If you want to start clvmd \fBand\fP
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enable cluster-wide logging then the command needs to be issued twice, eg:
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.br
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.BR clvmd
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.br
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.BR clvmd\ \-d2
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.
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.HP
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.BR \-d
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.RI [ value ]
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.br
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Set debug logging level.
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If \fB\-d\fP is specified without a \fIvalue\fP
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then 1 is assumed. \fIValue\fP can be:
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.PD 0
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.IP
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.BR 0
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\(em Disabled
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.IP
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.BR 1
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\(em Sends debug logs to stderr (implies \fB\-f\fP)
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.IP
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.BR 2
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\(em Sends debug logs to \fBsyslog\fP(3)
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.PD
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.
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.HP
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.BR \-E
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.IR lock_uuid
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.br
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Pass lock uuid to be reacquired exclusively when clvmd is restarted.
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.
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.HP
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.BR \-f
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.br
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Don't fork, run in the foreground.
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.
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.HP
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.BR \-h
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.br
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Show help information.
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.
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.HP
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.BR \-I
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.IR cluster_manager
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.br
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Selects the cluster manager to use for locking and internal
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communications. As it is quite possible to have multiple managers available on
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the same system you might have to manually specify this option to override the
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search.
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By default, omit \fB-I\fP is equivalent to \fB\-Iauto\fP.
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Clvmd will use the first cluster manager that succeeds,
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and it checks them in a predefined order
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.BR cman ,
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.BR corosync ,
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.BR openais .
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The available managers will be listed by order as part of the
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\fBclvmd \-h\fP output.
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.
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.HP
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.BR \-R
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.br
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Tells all the running instance of \fBclvmd\fP in the cluster to reload their device cache and
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re-read the lvm configuration file \fBlvm.conf\fP(5). This command should be run whenever the
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devices on a cluster system are changed.
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.
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.HP
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.BR \-S
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.br
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Tells the running \fBclvmd\fP to exit and reexecute itself, for example at the
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end of a package upgrade. The new instance is instructed to reacquire
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any locks in the same state as they were previously held. (Alternative
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methods of restarting the daemon have the side effect of changing
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exclusive LV locks into shared locks.)
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.
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.HP
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.BR \-t
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.IR timeout
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.br
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Specifies the \fItimeout\fP for commands to run around the cluster. This should not
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be so small that commands with many disk updates to do will fail, so you
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may need to increase this on systems with very large disk farms.
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The default is 60 seconds.
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.
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.HP
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.BR \-T
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.IR start_timeout
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.br
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Specifies the start timeout for \fBclvmd\fP daemon startup. If the
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daemon does not report that it has started up within this time then the parent
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command will exit with status of 5. This does NOT mean that \fBclvmd\fP has
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not started! What it means is that the startup has been delayed for some
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reason; the most likely cause of this is an inquorate cluster though it
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could be due to locking latencies on a cluster with large numbers of logical
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volumes. If you get the return code of 5 it is usually not necessary to
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restart \fBclvmd\fP it will start as soon as that blockage has cleared.
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This flag is to allow startup scripts to exit in a timely fashion even if the
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cluster is stalled for some reason.
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The default is \fB0\fP (no timeout) and the value is in seconds. Don't set this too
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small or you will experience spurious errors. 10 or 20 seconds might be
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sensible.
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This timeout will be ignored if you start \fBclvmd\fP with the \fB\-d\fP.
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.
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.HP
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.BR \-V
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.br
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Display the version of the cluster LVM daemon.
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.
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.SH ENVIRONMENT VARIABLES
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.TP
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.B LVM_CLVMD_BINARY
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The CLVMD binary to use when \fBclvmd\fP restart is requested.
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Defaults to \fI#CLVMD_PATH#\fP.
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.TP
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.B LVM_BINARY
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The LVM2 binary to use.
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Defaults to \fI#LVM_PATH#\fP.
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.SH FILES
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.I #CLVMD_PATH#
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.br
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.I #LVM_PATH#
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.SH SEE ALSO
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.BR syslog (3),
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.BR lvm.conf (5),
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.BR lvm (8)
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