CLVMD(8)CLVMD(8)NAMEclvmd - cluster LVM daemon
SYNOPSISclvmd [-d [<value>] [-C]] [-E <lock uuid>] [-f] [-h] [-I cluster_man‐
ager] [-R] [-S] [-t <timeout>] [-T <start timeout>] [-V]
DESCRIPTIONclvmd is the daemon that distributes LVM metadata updates around a
cluster. It must be running on all nodes in the cluster and will give
an error if a node in the cluster does not have this daemon running.
Enable debug logging. Value can be 0, 1 or 2.
0 disables debug logging
1 sends debug logs to stderr (implies -f option)
2 sends debug logs to syslog
If -d is specified without a value then 1 is assumed.
-C Only valid if -d is also specified. Tells all clvmds in a clus‐
ter to enable/disable debug logging. Without this switch, only
the local clvmd will change its debug level to that given with
This does not work correctly if specified on the command-line
that starts clvmd. If you want to start clvmd and enable clus‐
ter-wide logging then the command needs to be issued twice, eg:
Pass lock uuid to be reacquired exclusively when clvmd is
-f Don't fork, run in the foreground.
-h Show help information.
-I cluster manager
Selects the cluster manager to use for locking and internal com‐
munications, the available managers will be listed as part of
the clvmd-h output. clvmd will use the first cluster manager
that succeeds, and it checks them in the order
cman,corosync,openais. As it is quite possible to have (eg)
corosync and cman available on the same system you might have to
manually specify this option to override the search.
-R Tells all the running clvmds in the cluster to reload their
device cache and re-read the lvm configuration file. This com‐
mand should be run whenever the devices on a cluster system are
-S Tells the running clvmd to exit and reexecute itself, for exam‐
ple at the end of a package upgrade. The new instance is
instructed to reacquire any locks in the same state as they were
previously held. (Alternative methods of restarting the daemon
have the side effect of changing exclusive LV locks into shared
Specifies the timeout for commands to run around the cluster.
This should not be so small that commands with many disk updates
to do will fail, so you may need to increase this on systems
with very large disk farms. The default is 30 seconds.
Specifies the timeout for clvmd daemon startup. If the daemon
does not report that it has started up within this time then the
parent command will exit with status of 5. This does NOT mean
that clvmd has not started! What it means is that the startup of
clvmd has been delayed for some reason; the most likely cause of
this is an inquorate cluster though it could be due to locking
latencies on a cluster with large numbers of logical volumes. If
you get the return code of 5 it is usually not necessary to
restart clvmd - it will start as soon as that blockage has
cleared. This flag is to allow startup scripts to exit in a
timely fashion even if the cluster is stalled for some reason.
The default is 0 (no timeout) and the value is in seconds. Don't
set this too small or you will experience spurious errors. 10 or
20 seconds might be sensible.
This timeout will be ignored if you start clvmd with the -d
-V Display the version of the cluster LVM daemon.
The CLVMD binary to use when clmvd restart is requested.
Defaults to /usr/sbin/clvmd.
The LVM2 binary to use. Defaults to /usr/sbin/lvm.
SEE ALSOlvm(8)Red Hat Inc LVM TOOLS 2.02.105(2)-RHEL7 (2014-03-26) CLVMD(8)