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81 lines
2.7 KiB
Groff
81 lines
2.7 KiB
Groff
.TH CLVMD 8 "LVM TOOLS" "Red Hat Inc" \" -*- nroff -*-
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.SH NAME
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clvmd \- cluster LVM daemon
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.SH SYNOPSIS
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.B clvmd
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[\-d [<value>]] [\-C] [\-h]
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[\-R]
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[\-t <timeout>]
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[\-T <start timeout>]
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[\-V]
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.SH DESCRIPTION
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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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.SH OPTIONS
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.TP
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.I \-d [<value>]
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Enable debug logging. Value can be 0, 1 or 2.
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.br
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0 disables debug logging in a running clvmd
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.br
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1 sends debug logs to stderr (clvmd will not fork in this case)
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.br
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2 sends debug logs to syslog
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.br
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If
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.B -d
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is specified without a value then 1 is assumed if you are starting a
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new clvmd, 2 if you are enabling debug in a running clvmd.
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.TP
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.I \-C
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Only valid if
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.B -d
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is also specified. 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
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.B -d.
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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
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.B and
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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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clvmd
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.br
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clvmd -d2
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.br
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.TP
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.I \-t <timeout>
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Specifies the timeout 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 30 seconds.
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.TP
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.I \-T <start timeout>
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Specifies the timeout for clvmd daemon startup. If the daemon does not report
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that it has started up within this time then the parent command will exit with
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status of 5. This does NOT mean that clvmd has not started! What it means is
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that the startup of clvmd has been delayed for some reason; the most likely
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cause of this is an inquorate cluster though it could be due to locking
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latencies on a cluster with large numbers of logical volumes. If you get the
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return code of 5 it is usually not necessary to restart clvmd - it will start
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as soon as that blockage has cleared. This flag is to allow startup scripts
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to exit in a timely fashion even if the cluster is stalled for some reason.
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.br
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The default is 0 (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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.br
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This timeout will be ignored if you start clvmd with the -d switch.
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.TP
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.I \-R
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Tells all the running clvmds in the cluster to reload their device cache and
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re-read the lvm configuration file. This command should be run whenever the
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devices on a cluster system are changed.
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.TP
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.I \-V
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Display the version of the cluster LVM daemon.
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.SH SEE ALSO
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.BR lvm (8)
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