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9c2095311e
Bugfix: Add (most probably unfinished) support for -E arg with list of exclusive locks. (During clvmd restart all exclusive locks would have been lost and in fact, if there would have been an exclusive lock, usage text would be printed and clvmd exits.) Instead of parsing list options multiple times every time some lock UUID is checked - put them straight into the hash table - make the code easier to understand as well. Remove was_ex_lock() function (replaced with dm_hash_lookup()). Swap return value for get_initial_state() (1 means success). Update man pages and usage info for -E option.
100 lines
3.4 KiB
Groff
100 lines
3.4 KiB
Groff
.TH CLVMD 8 "LVM TOOLS #VERSION#" "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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[\-E <lock uuid>]
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[\-R]
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[\-S]
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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
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.br
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1 sends debug logs to stderr (implies -f option)
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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.
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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 \-E <lock uuid>
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Pass lock uuid to be reacquired exclusively when clvmd is restarted.
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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 \-S
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Tells the running clvmd 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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.TP
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.I \-I
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Selects the cluster manager to use for locking and internal communications,
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the available managers will be listed as part of the 'clvmd -h' output.
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clvmd will use the first cluster manager that succeeds, and it checks them
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in the order cman,corosync,openais. As it is quite possible to have
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(eg) corosync and cman available on the same system you might have to
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manually specify this option to override the search.
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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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