NAME¶
lvmetad — LVM metadata cache daemon
SYNOPSIS¶
lvmetad [
-l {
all|
wire|
debug}] [
-p
pidfile_path] [
-s socket_path] [
-f] [
-h]
[
-V] [
-?]
DESCRIPTION¶
lvmetad is a metadata caching daemon for LVM. The daemon receives notifications
from udev rules (which must be installed for LVM to work correctly when
lvmetad is in use). Through these notifications, lvmetad has an up-to-date and
consistent image of the volume groups available in the system.
lvmetad is used by LVM only if it is enabled in
lvm.conf(5) by specifying
the
global/use_lvmetad setting. If this is not defined in the LVM
configuration explicitly then default setting is used instead (see the output
of
lvm dumpconfig --type default global/use_lvmetad command).
OPTIONS¶
To run the daemon in a test environment both the pidfile_path and the
socket_path should be changed from the defaults.
- -f
- Don't fork, but run in the foreground.
- -h, -?
- Show help information.
- -l
{all|wire|debug}
- Select the type of log messages to generate. Messages are logged by
syslog. Additionally, when -f is given they are also sent to standard
error. Since release 2.02.98, there are two classes of messages: wire and
debug. Selecting 'all' supplies both and is equivalent to a
comma-separated list -l wire,debug. Prior to release 2.02.98, repeating -d
from 1 to 3 times, viz. -d, -dd, -ddd, increased the detail of
messages.
- -p pidfile_path
- Path to the pidfile. This overrides both the built-in default
(/run/lvmetad.pid) and the environment variable
LVM_LVMETAD_PIDFILE. This file is used to prevent more than one
instance of the daemon running simultaneously.
- -s socket_path
- Path to the socket file. This overrides both the built-in default
(/run/lvm/lvmetad.socket) and the environment variable
LVM_LVMETAD_SOCKET. To communicate successfully with lvmetad, all
LVM2 processes should use the same socket path.
- -V
- Display the version of lvmetad daemon.
ENVIRONMENT VARIABLES¶
- LVM_LVMETAD_PIDFILE
- Path for the pid file.
- LVM_LVMETAD_SOCKET
- Path for the socket file.
SEE ALSO¶
lvm(8),
lvm.conf(5)