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LVMPOLLD(8) System Manager's Manual LVMPOLLD(8)
NAME
lvmpolld -- LVM poll daemon
SYNOPSIS
lvmpolld [-l|--log {all|wire|debug}] [-p|--pidfile pidfile_path] [-s|--socket socket_path]
[-B|--binary lvm_binary_path] [-t|--timeout timeout_value] [-f|--foreground] [-h|--help]
[-V|--version]
lvmpolld [--dump]
DESCRIPTION
lvmpolld is polling daemon for LVM. The daemon receives requests for polling of already
initialised operations originating in LVM2 command line tool. The requests for polling
originate in the lvconvert, pvmove, lvchange or vgchange LVM2 commands.
The purpose of lvmpolld is to reduce the number of spawned background processes per other-
wise unique polling operation. There should be only one. It also eliminates the possibil-
ity of unsolicited termination of background process by external factors.
lvmpolld is used by LVM only if it is enabled in lvm.conf(5) by specifying the
global/use_lvmpolld setting. If this is not defined in the LVM configuration explicitly
then default setting is used instead (see the output of lvmconfig --type default
global/use_lvmpolld 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, --foreground
Don't fork, but run in the foreground.
-h, --help
Show help information.
-l, --log {all|wire|debug}
Select the type of log messages to generate. Messages are logged by syslog. Addi-
tionally, when -f is given they are also sent to standard error. There are two
classes of messages: wire and debug. Selecting 'all' supplies both and is equiva-
lent to a comma-separated list -l wire,debug.
-p, --pidfile pidfile_path
Path to the pidfile. This overrides both the built-in default (/run/lvmpolld.pid)
and the environment variable LVM_LVMPOLLD_PIDFILE. This file is used to prevent
more than one instance of the daemon running simultaneously.
-s, --socket socket_path
Path to the socket file. This overrides both the built-in default (/run/lvm/lvm-
polld.socket) and the environment variable LVM_LVMPOLLD_SOCKET.
-t, --timeout timeout_value
The daemon may shutdown after being idle for the given time (in seconds). When the
option is omitted or the value given is zero the daemon never shutdowns on idle.
-B, --binary lvm_binary_path
Optional path to alternative LVM binary (default: /usr/lvm). Use for testing pur-
poses only.
-V, --version
Display the version of lvmpolld daemon.
--dump Contact the running lvmpolld daemon to obtain the complete state and print it out
in a raw format.
ENVIRONMENT VARIABLES
LVM_LVMPOLLD_PIDFILE
Path for the pid file.
LVM_LVMPOLLD_SOCKET
Path for the socket file.
SEE ALSO
lvm(8), lvm.conf(5)
Red Hat Inc LVM TOOLS 2.03.11(2) (2021-01-08) LVMPOLLD(8)
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