1 .TH CLVMD 8 "LVM TOOLS #VERSION#" "Red Hat Inc" \" -*- nroff -*-
3 clvmd \- cluster LVM daemon
6 [\-d [<value>]] [\-C] [\-h]
13 clvmd is the daemon that distributes LVM metadata updates around a cluster.
14 It must be running on all nodes in the cluster and will give an error
15 if a node in the cluster does not have this daemon running.
19 Enable debug logging. Value can be 0, 1 or 2.
21 0 disables debug logging in a running clvmd
23 1 sends debug logs to stderr (clvmd will not fork in this case)
25 2 sends debug logs to syslog
29 is specified without a value then 1 is assumed if you are starting a
30 new clvmd, 2 if you are enabling debug in a running clvmd.
35 is also specified. Tells all clvmds in a cluster to enable/disable debug logging.
36 Without this switch, only the local clvmd will change its debug level to that
40 This does not work correctly if specified on the command-line that starts clvmd.
41 If you want to start clvmd
43 enable cluster-wide logging then the command needs to be issued twice, eg:
51 Specifies the timeout for commands to run around the cluster. This should not
52 be so small that commands with many disk updates to do will fail, so you
53 may need to increase this on systems with very large disk farms.
54 The default is 30 seconds.
56 .I \-T <start timeout>
57 Specifies the timeout for clvmd daemon startup. If the daemon does not report
58 that it has started up within this time then the parent command will exit with
59 status of 5. This does NOT mean that clvmd has not started! What it means is
60 that the startup of clvmd has been delayed for some reason; the most likely
61 cause of this is an inquorate cluster though it could be due to locking
62 latencies on a cluster with large numbers of logical volumes. If you get the
63 return code of 5 it is usually not necessary to restart clvmd - it will start
64 as soon as that blockage has cleared. This flag is to allow startup scripts
65 to exit in a timely fashion even if the cluster is stalled for some reason.
67 The default is 0 (no timeout) and the value is in seconds. Don't set this too
68 small or you will experience spurious errors. 10 or 20 seconds might be
71 This timeout will be ignored if you start clvmd with the -d switch.
74 Tells all the running clvmds in the cluster to reload their device cache and
75 re-read the lvm configuration file. This command should be run whenever the
76 devices on a cluster system are changed.
79 Tells the running clvmd to exit and reexecute itself, for example at the
80 end of a package upgrade. The new instance is instructed to reacquire
81 any locks in the same state as they were previously held. (Alternative
82 methods of restarting the daemon have the side effect of changing
83 exclusive LV locks into shared locks.)
86 Selects the cluster manager to use for locking and internal communications,
87 the available managers will be listed as part of the 'clvmd -h' output.
88 clvmd will use the first cluster manager that succeeds, and it checks them
89 in the order cman,gulm,corosync,openais. As it is quite possible to have
90 (eg) corosync and cman available on the same system you might have to
91 manually specify this option to override the search.
94 Display the version of the cluster LVM daemon.