.TH LVMPOLLD 8 "LVM TOOLS 2.03.38(2) (2025-12-15)" "Red Hat, Inc." \" -*- nroff -*-
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..
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.SH NAME
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lvmpolld \(em LVM poll daemon
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.SH SYNOPSIS
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.NSY lvmpolld 1
.RB [ \-B | \-\-binary\ \c
.IR lvm_bi\%nary_path ]
.RB [ \-f | \-\-foreground ]
.RB [ \-h | \-\-help ]
.RB [ \-l | \-\-log\ \c
.BR all |\: wire | debug ]
.RB [ \-p | \-\-pidfile\ \c
.IR pidfile_path ]
.RB [ \-s | \-\-socket\ \c
.IR socket_path ]
.RB [ \-t | \-\-timeout\ \c
.IR timeout_value ]
.RB [ \-V | \-\-version ]
.sp
.NSY lvmpolld
.RB [ \-\-dump ]
.ad
.hy
.PD
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.SH DESCRIPTION
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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 \fBlvconvert\fP, \fBpvmove\fP,
\fBlvchange\fP or \fBvgchange\fP LVM2 commands.
.P
The purpose of lvmpolld is to reduce the number of spawned background processes
per otherwise unique polling operation. There should be only one. It also
eliminates the possibility of unsolicited termination of background process by
external factors.
.P
lvmpolld is used by LVM only if it is enabled in \fBlvm.conf\fP(5) by
specifying the \fBglobal/use_lvmpolld\fP setting. If this is not defined in the
LVM configuration explicitly then default setting is used instead (see the
output of \fBlvmconfig \-\-type default global/use_lvmpolld\fP command).
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.SH OPTIONS
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To run the daemon in a test environment both the pidfile_path and the
socket_path should be changed from the defaults.
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.TP
\fB\-B\fP|\fB\-\-binary\fP \fIlvm_binary_path\fP
Optional path to alternative LVM binary
(default: \fI/usr/bin/lvm\fP).
Use for testing purposes only.
.
.TP
.B \-\-dump
Contact the running lvmpolld daemon to obtain the complete state
and print it out in a raw format.
.
.TP
.BR \-f | \-\-foreground
Don't fork, but run in the foreground.
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.TP
.BR \-h | \-\-help
Show help information.
.
.TP
.BR \-l | \-\-log " " all | wire | debug
Select the type of log messages to generate.
Messages are logged by syslog.
Additionally, when \fB\-f\fP is given they are also sent to standard error.
There are two classes of messages: wire and debug.
Selecting '\fBall\fP' supplies both
and is equivalent to a comma-separated list \fB\-l wire,debug\fP.
.
.TP
\fB\-p\fP|\fB\-\-pidfile\fP \fIpidfile_path\fP
Path to the pidfile. This overrides both the built-in default
(\fI/run/lvmpolld.pid\fP)
and the environment variable
\fBLVM_LVMPOLLD_PIDFILE\fP.
This file is used to prevent more than one instance
of the daemon running simultaneously.
.
.TP
\fB\-s\fP|\fB\-\-socket\fP \fIsocket_path\fP
Path to the socket file. This overrides both the built-in default
(\fI/run/lvm/lvmpolld.socket\fP) and the environment variable
\fBLVM_LVMPOLLD_SOCKET\fP.
.
.TP
\fB\-t\fP|\fB\-\-timeout\fP \fItimeout_value\fP
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.
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.TP
.BR \-V | \-\-version
Display the version of lvmpolld daemon.
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.SH ENVIRONMENT VARIABLES
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.TP
.B LVM_LVMPOLLD_PIDFILE
Path for the pid file.
.
.TP
.B LVM_LVMPOLLD_SOCKET
Path for the socket file.
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.SH SEE ALSO
.
.BR lvm (8),
.BR lvm.conf (5),
.BR lvchange (8),
.BR lvconvert (8),
.BR pvmove (8),
.BR vgchange (8)