CLVMD(8)                                                      System Manager's Manual                                                     CLVMD(8)

NAME

       clvmd - cluster LVM daemon

SYNOPSIS

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

DESCRIPTION

       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.

OPTIONS

       -d[<value>]
              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 cluster to enable/disable debug logging.  Without this  switch,  only  the
              local clvmd will change its debug level to that given with -d.
              This does not work correctly if specified on the command-line that starts clvmd.  If you want to start clvmd and enable cluster-wide
              logging then the command needs to be issued twice, eg:
              clvmd
              clvmd -d2

       -t <timeout>
              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 par-
              ent 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 switch.

       -E <lock uuid>
              Pass lock uuid to be reacquired exclusively when clvmd is restarted.

       -R     Tells all the running clvmds in the cluster to reload their device cache and re-read the lvm configuration file. This command should
              be run whenever the devices on a cluster system are changed.

       -S     Tells the running clvmd to exit and reexecute itself, for example 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 locks.)

       -I     Selects the cluster manager to use for locking and internal communications, 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.

       -V     Display the version of the cluster LVM daemon.

ENVIRONMENT VARIABLES

       LVM_CLVMD_BINARY
              The CLVMD binary to use when clmvd restart is requested.  Defaults to /usr/sbin/clvmd.

       LVM_BINARY
              The LVM2 binary to use. Defaults to /sbin/lvm.

SEE ALSO

       lvm(8)

Red Hat Inc                                              LVM TOOLS 2.02.95(2) (2012-03-06)                                                CLVMD(8)