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186 lines
5.1 KiB
Plaintext
186 lines
5.1 KiB
Plaintext
.TH DMEVENTD 8 "DM TOOLS #VERSION#" "Red Hat Inc" \" -*- nroff -*-
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.
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.SH NAME
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.
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dmeventd \(em Device-mapper event daemon
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.
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.SH SYNOPSIS
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.
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.B dmeventd
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.RB [ -d
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.RB [ -d
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.RB [ -d ]]]
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.RB [ -f ]
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.RB [ -h ]
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.RB [ -l ]
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.RB [ -R ]
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.RB [ -V ]
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.RB [ -? ]
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.
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.SH DESCRIPTION
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.
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dmeventd is the event monitoring daemon for device-mapper devices.
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Library plugins can register and carry out actions triggered when
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particular events occur.
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.
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.
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.SH OPTIONS
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.
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.HP
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.BR -d
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.br
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Repeat from 1 to 3 times (
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.BR -d ,
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.BR -dd ,
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.BR -ddd
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) to increase the detail of
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debug messages sent to syslog.
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Each extra d adds more debugging information.
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.
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.HP
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.BR -f
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.br
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Don't fork, run in the foreground.
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.
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.HP
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.BR -h
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.br
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Show help information.
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.
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.HP
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.BR -l
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.br
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Log through stdout and stderr instead of syslog.
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This option works only with option -f, otherwise it is ignored.
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.
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.HP
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.BR -?
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.br
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Show help information on stderr.
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.
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.HP
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.BR -R
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.br
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Replace a running dmeventd instance. The running dmeventd must be version
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2.02.77 or newer. The new dmeventd instance will obtain a list of devices and
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events to monitor from the currently running daemon.
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.
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.HP
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.BR -V
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.br
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Show version of dmeventd.
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.
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.SH LVM PLUGINS
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.
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.HP
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.BR Mirror
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.br
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Attempts to handle device failure automatically. See
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.BR lvm.conf (5).
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.
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.HP
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.BR Raid
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.br
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Attempts to handle device failure automatically. See
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.BR lvm.conf (5).
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.
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.HP
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.BR Snapshot
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.br
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Monitors how full a snapshot is becoming and emits a warning to
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syslog when it exceeds 80% full.
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The warning is repeated when 85%, 90% and 95% of the snapshot is filled.
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See
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.BR lvm.conf (5).
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Snapshot which runs out of space gets invalid and when it is mounted,
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it gets umounted if possible.
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.
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.HP
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.BR Thin
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.br
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Monitors how full a thin pool data and metadata is becoming and emits
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a warning to syslog when it exceeds 80% full.
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The warning is repeated when more then 85%, 90% and 95%
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of the thin pool is filled. See
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.BR lvm.conf (5).
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When a thin pool fills over 50% (data or metadata) thin plugin calls
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configured \fIdmeventd/thin_command\fP with every 5% increase.
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With default setting it calls internal
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\fBlvm lvextend --use-policies\fP to resize thin pool
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when it's been filled above configured threshold
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\fIactivation/thin_pool_autoextend_threshold\fP.
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If the command fails, dmeventd thin plugin will keep
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retrying execution with increasing time delay between
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retries upto 42 minutes.
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User may also configure external command to support more advanced
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maintenance operations of a thin pool.
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Such external command can e.g. remove some unneeded snapshots,
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use \fBfstrim\fP(8) to free recover space in a thin pool,
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but also can use \fBlvextend --use-policies\fP if other actions
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have not released enough space.
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Command is executed with environmental variable
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\fBLVM_RUN_BY_DMEVENTD=1\fP so any lvm2 command executed
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in this environment will not try to interact with dmeventd.
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To see the fullness of a thin pool command may check these
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two environmental variables
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\fBDMEVENTD_THIN_POOL_DATA\fP and \fBDMEVENTD_THIN_POOL_METADATA\fP.
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Command can also read status with tools like \fBlvs\fP(8).
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.HP
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.BR Vdo
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.br
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Monitors how full a VDO pool data is becoming and emits
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a warning to syslog when it exceeds 80% full.
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The warning is repeated when more then 85%, 90% and 95%
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of the VDO pool is filled. See
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.BR lvm.conf (5).
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When a VDO pool fills over 50% vdo plugin calls
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configured \fIdmeventd/vdo_command\fP with every 5% increase.
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With default setting it calls internal
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\fBlvm lvextend --use-policies\fP to resize VDO pool
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when it's been filled above the configured threshold
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\fIactivation/vdo_pool_autoextend_threshold\fP.
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If the command fails, dmeventd vdo plugin will keep
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retrying execution with increasing time delay between
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retries upto 42 minutes.
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User may also configure external command to support more advanced
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maintenance operations of a VDO pool.
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Such external command can e.g. remove some unneeded space
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with \fBfstrim\fP(8),
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but also can use \fBlvextend --use-policies\fP if other actions
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have not released enough space.
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Command is executed with environmental variable
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\fBLVM_RUN_BY_DMEVENTD=1\fP so any lvm2 command executed
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in this environment will not try to interact with dmeventd.
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To see the fullness of a VDO pool command may check this
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environmental variable \fBDMEVENTD_VDO_POOL\fP.
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Command can also read status with tools like \fBlvs\fP(8).
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.
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.SH ENVIRONMENT VARIABLES
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.
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.TP
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.B DMEVENTD_THIN_POOL_DATA
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Variable is set by thin plugin and is available to executed program. Value present
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actual usage of thin pool data volume. Variable is not set when error event
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is processed.
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.TP
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.B DMEVENTD_THIN_POOL_METADATA
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Variable is set by thin plugin and is available to executed program. Value present
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actual usage of thin pool metadata volume. Variable is not set when error event
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is processed.
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.TP
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.B DMEVENTD_VDO_POOL
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Variable is set by vdo plugin and is available to executed program. Value present
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actual usage of VDO pool data volume. Variable is not set when error event
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is processed.
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.TP
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.B LVM_RUN_BY_DMEVENTD
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Variable is set by thin and vdo plugin to prohibit recursive interation
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with dmeventd by any executed lvm2 command from
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a thin_command, vdo_command environment.
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.
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.SH SEE ALSO
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.
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.BR lvm (8),
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.BR lvm.conf (5)
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