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NAME | SYNOPSIS | DESCRIPTION | OPTIONS | NOTES | ENVIRONMENT VARIABLES | FILES | SEE ALSO | COLOPHON |
CLVMD(8) System Manager's Manual CLVMD(8)
clvmd — cluster LVM daemon
clvmd [-C] [-d [value]] [-E lock_uuid] [-f] [-h] [-I cluster_manager]
[-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.
Also see lvmlockd(8) for a newer method of using LVM on shared
storage.
-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
-d [value]
Set debug logging level. If -d is specified without a value
then 1 is assumed. Value can be:
0 — Disabled
1 — Sends debug logs to stderr (implies -f)
2 — Sends debug logs to syslog(3)
-E lock_uuid
Pass lock uuid to be reacquired exclusively when clvmd is
restarted.
-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
communications. As it is quite possible to have multiple
managers available on the same system you might have to
manually specify this option to override the search.
By default, omit -I is equivalent to -Iauto. Clvmd will use
the first cluster manager that succeeds, and it checks them in
a predefined order cman, corosync, openais. The available
managers will be listed by order as part of the clvmd -h
output.
-R
Tells all the running instance of clvmd in the cluster to
reload their device cache and re-read the lvm configuration
file lvm.conf(5). 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.)
-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 60
seconds.
-T start_timeout
Specifies the start 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 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.
Activation
In a clustered VG, clvmd is used for activation, and the following
values are possible with lvchange/vgchange -a:
y|sy clvmd activates the LV in shared mode (with a shared lock),
allowing multiple nodes to activate the LV concurrently. If
the LV type prohibits shared access, such as an LV with a
snapshot, an exclusive lock is automatically used instead.
clvmd attempts to activate the LV concurrently on all nodes.
ey clvmd activates the LV in exclusive mode (with an exclusive
lock), allowing a single node to activate the LV. clvmd
attempts to activate the LV concurrently on all nodes, but
only one will succeed.
ly clvmd attempts to activate the LV only on the local node. If
the LV type allows concurrent access, then shared mode is
used, otherwise exclusive.
n clvmd attempts to deactivate the LV on all nodes.
ln clvmd attempts to deactivate the LV on the local node.
LVM_CLVMD_BINARY
The CLVMD binary to use when clvmd restart is requested.
Defaults to /data/lvmtest/usr/sbin/clvmd.
LVM_BINARY
The LVM2 binary to use. Defaults to /data/lvmtest/sbin/lvm.
/data/lvmtest/usr/sbin/clvmd
/data/lvmtest/sbin/lvm
syslog(3), lvm.conf(5), lvm(8), lvmlockd(8), lvmsystemid(7)
This page is part of the lvm2 (Logical Volume Manager 2) project.
Information about the project can be found at
⟨http://www.sourceware.org/lvm2/⟩. If you have a bug report for this
manual page, send it to linux-lvm@redhat.com. This page was obtained
from the project's upstream Git repository
⟨git://sourceware.org/git/lvm2.git⟩ on 2017-07-05. If you discover
any rendering problems in this HTML version of the page, or you
believe there is a better or more up-to-date source for the page, or
you have corrections or improvements to the information in this
COLOPHON (which is not part of the original manual page), send a mail
to man-pages@man7.org
Red Hat Inc LVM TOOLS 2.02.173(2)-git (2017-06-28) CLVMD(8)
Pages that refer to this page: cmirrord(8), lvchange(8), lvconvert(8), lvcreate(8), lvdisplay(8), lvextend(8), lvm(8), lvmconfig(8), lvmdiskscan(8), lvm-fullreport(8), lvm-lvpoll(8), lvreduce(8), lvremove(8), lvrename(8), lvresize(8), lvs(8), lvscan(8), pvchange(8), pvck(8), pvcreate(8), pvdisplay(8), pvmove(8), pvremove(8), pvresize(8), pvs(8), pvscan(8), vgcfgbackup(8), vgcfgrestore(8), vgchange(8), vgck(8), vgconvert(8), vgcreate(8), vgdisplay(8), vgexport(8), vgextend(8), vgimport(8), vgimportclone(8), vgmerge(8), vgmknodes(8), vgreduce(8), vgremove(8), vgrename(8), vgs(8), vgscan(8), vgsplit(8)