1CLVMD(8) System Manager's Manual CLVMD(8)
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6 clvmd — cluster LVM daemon
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9 clvmd [-C] [-d [value]] [-E lock_uuid] [-f] [-h] [-I cluster_manager]
10 [-R] [-S] [-t timeout] [-T start_timeout] [-V]
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13 clvmd is the daemon that distributes LVM metadata updates around a
14 cluster. It must be running on all nodes in the cluster and will give
15 an error if a node in the cluster does not have this daemon running.
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18 -C
19 Only valid if -d is also specified. Tells all clvmds in a clus‐
20 ter to enable/disable debug logging. Without this switch, only
21 the local clvmd will change its debug level to that given with
22 -d.
23 This does not work correctly if specified on the command-line
24 that starts clvmd. If you want to start clvmd and enable clus‐
25 ter-wide logging then the command needs to be issued twice, eg:
26 clvmd
27 clvmd -d2
28 -d [value]
30 Set debug logging level. If -d is specified without a value
31 then 1 is assumed. Value can be:
32 0 — Disabled
33 1 — Sends debug logs to stderr (implies -f)
34 2 — Sends debug logs to syslog(3)
35 -E lock_uuid
37 Pass lock uuid to be reacquired exclusively when clvmd is
38 restarted.
39 -f
41 Don't fork, run in the foreground.
42 -h
44 Show help information.
45 -I cluster_manager
47 Selects the cluster manager to use for locking and internal com‐
48 munications. As it is quite possible to have multiple managers
49 available on the same system you might have to manually specify
50 this option to override the search.
51 By default, omit -I is equivalent to -Iauto. Clvmd will use the
53 first cluster manager that succeeds, and it checks them in a
54 predefined order cman, corosync, openais. The available man‐
55 agers will be listed by order as part of the clvmd -h output.
56 -R
58 Tells all the running instance of clvmd in the cluster to reload
59 their device cache and re-read the lvm configuration file
60 lvm.conf(5). This command should be run whenever the devices on
61 a cluster system are changed.
62 -S
64 Tells the running clvmd to exit and reexecute itself, for exam‐
65 ple at the end of a package upgrade. The new instance is
66 instructed to reacquire any locks in the same state as they were
67 previously held. (Alternative methods of restarting the daemon
68 have the side effect of changing exclusive LV locks into shared
69 locks.)
70 -t timeout
72 Specifies the timeout for commands to run around the cluster.
73 This should not be so small that commands with many disk updates
74 to do will fail, so you may need to increase this on systems
75 with very large disk farms. The default is 60 seconds.
76 -T start_timeout
78 Specifies the start timeout for clvmd daemon startup. If the
79 daemon does not report that it has started up within this time
80 then the parent command will exit with status of 5. This does
81 NOT mean that clvmd has not started! What it means is that the
82 startup has been delayed for some reason; the most likely cause
83 of this is an inquorate cluster though it could be due to lock‐
84 ing latencies on a cluster with large numbers of logical vol‐
85 umes. If you get the return code of 5 it is usually not neces‐
86 sary to restart clvmd it will start as soon as that blockage has
87 cleared. This flag is to allow startup scripts to exit in a
88 timely fashion even if the cluster is stalled for some reason.
89 The default is 0 (no timeout) and the value is in seconds. Don't
91 set this too small or you will experience spurious errors. 10 or
92 20 seconds might be sensible.
93 This timeout will be ignored if you start clvmd with the -d.
95 -V
97 Display the version of the cluster LVM daemon.
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100 LVM_CLVMD_BINARY
101 The CLVMD binary to use when clvmd restart is requested.
102 Defaults to /usr/sbin/clvmd.
103 LVM_BINARY
105 The LVM2 binary to use. Defaults to /sbin/lvm.
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108 /usr/sbin/clvmd
109 /sbin/lvm
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112 syslog(3), lvm.conf(5), lvm(8)
113Red Hat Inc LVM TOOLS 2.02.143(2)-RHEL6 (2016-12-13) CLVMD(8)