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87 lines
2.8 KiB
Groff
87 lines
2.8 KiB
Groff
.TH LVMETAD 8 "LVM TOOLS #VERSION#" "Red Hat Inc" \" -*- nroff -*-
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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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.B lvmpolld
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.RB [ \-l
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.RI { all | wire | debug }]
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.RB [ \-p
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.IR pidfile_path ]
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.RB [ \-s
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.IR socket_path ]
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.RB [ \-B
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.IR lvm_binary_path ]
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.RB [ \-t
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.IR timeout_value ]
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.RB [ \-f ]
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.RB [ \-h ]
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.RB [ \-V ]
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.RB [ \-? ]
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.SH DESCRIPTION
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lvmpolld is polling daemon for LVM. The daemon receives requests for polling
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of already initialised operations originating in LVM2 command line tool.
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The requests for polling originates in \fBlvconvert\fP, \fBpvmove\fP,
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\fBlvchange\fP or \fBvgchange\fP LVM2 command.
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The purpose of lvmpolld is to reduce the number of spawned background processes
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per otherwise unique polling operation. There should be only one. It also eliminates
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the possibility of unsolicited termination of background process by external factors.
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lvmpolld is used by LVM only if it is enabled in \fBlvm.conf\fP(5) by specifying the
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\fBglobal/use_lvmpolld\fP setting. If this is not defined in the LVM configuration
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explicitly then default setting is used instead (see the output of
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\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
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socket_path should be changed from the defaults.
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.TP
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.B \-f
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Don't fork, but run in the foreground.
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.TP
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.BR \-h ", " \-?
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Show help information.
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.TP
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.IR \fB\-l " {" all | wire | debug }
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Select the type of log messages to generate.
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Messages are logged by syslog.
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Additionally, when \-f is given they are also sent to standard error.
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There are two classes of messages: wire and debug. Selecting 'all' supplies both
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and is equivalent to a comma-separated list \-l wire,debug.
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.TP
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.B \-p \fIpidfile_path
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Path to the pidfile. This overrides both the built-in default
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(#DEFAULT_PID_DIR#/lvmpolld.pid) and the environment variable
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\fBLVM_LVMPOLLD_PIDFILE\fP. This file is used to prevent more
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than one instance of the daemon running simultaneously.
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.TP
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.B \-s \fIsocket_path
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Path to the socket file. This overrides both the built-in default
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(#DEFAULT_RUN_DIR#/lvmpolld.socket) and the environment variable
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\fBLVM_LVMPOLLD_SOCKET\fP.
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.TP
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.B \-t \fItimeout_value
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When runs as native systemd service daemon may shutdown after being
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idle for the given time (in seconds). When the option is omitted or
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the value given is zero the daemon never shutdowns on idle. When
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the daemon doesn't run as native systemd service the timeout is
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ignored and never shutdowns on idle.
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.TP
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.B \-B \fIlvm_binary_path
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Optional path to alternative LVM binary (default: #LVM_PATH#). Use for
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testing purposes only.
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.TP
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.B \-V
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Display the version of lvmpolld daemon.
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.SH ENVIRONMENT VARIABLES
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.TP
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.B LVM_LVMPOLLD_PIDFILE
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Path for the pid file.
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.TP
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.B LVM_LVMPOLLD_SOCKET
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Path for the socket file.
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.SH SEE ALSO
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.BR lvm (8),
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.BR lvm.conf (5)
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