clvmd man page on Oracle

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CLVMD(8)							      CLVMD(8)

       clvmd - cluster LVM daemon

       clvmd  [-d  [<value>] [-C]] [-E <lock uuid>] [-f] [-h] [-I cluster_man‐
       ager] [-R] [-S] [-t <timeout>] [-T <start timeout>] [-V]

       clvmd 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:
	      clvmd -d2

       -E<lock uuid>
	      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.

       -T<start timeout>
	      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.


Red Hat Inc	   LVM TOOLS 2.02.105(2)-RHEL7 (2014-03-26)	      CLVMD(8)

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