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114 lines
2.9 KiB
Bash
Executable File
114 lines
2.9 KiB
Bash
Executable File
#!/bin/bash
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# -*- sh -*-
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: << =cut
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=head1 NAME
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dm_cache_statistics_ - Wildcard-plugin to dm-cache statistics.
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=head1 CONFIGURATION
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This plugin does not normally require configuration.
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The plugin may need to run as root to determine dm-cache status.
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This is configured like this:
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[dm_cache_*]
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user root
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This is a wildcard plugin. To monitor a cached device-mapper volume,
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link volume to this file. For example,
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ln -s /usr/share/munin/plugins/dm_cache_statistics_ \
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/etc/munin/plugins/dm_cache_statistics_vg_1122____lv_home
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will monitor vg_1122-lv_home.
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Please note that ____ (4 underscores) is replaced by - (dash) symbol.
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This is workaround for http://munin-monitoring.org/ticket/1236
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Cached volumes found in dmsetup status can be monitored.
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=head1 AUTHOR
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Original idea: Steinar H. Gunderson <sgunderson@bigfoot.com>
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Found in Google by keywords "munin dm-cache"
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Copyright (C) 2014 Vladimir Stackov <amigo.elite@gmail.com>
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=head1 LICENSE
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GPLv2
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=head1 MAGIC MARKERS
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#%# family=auto
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#%# capabilities=autoconf suggest
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=cut
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CVOL=${0##*dm_cache_statistics_}
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#workaround for http://munin-monitoring.org/ticket/1236
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CVOL=${CVOL/____/-}
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case $1 in
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autoconf)
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env dmsetup status > /dev/null 2>&1
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if [[ $? -eq 0 ]]; then
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echo yes
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exit 0
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else
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echo "no (env dmsetup returned value > 0)"
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exit 0
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fi
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;;
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suggest)
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dmsetup status | grep ' cache ' | awk -F: '{print $1}'
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exit $?
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;;
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config)
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echo "graph_title $CVOL dm-cache cache statistics"
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echo 'graph_args --base 1000'
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echo 'graph_vlabel blocks/sec'
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echo 'graph_category disk'
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echo "graph_info This graph shows the dm-cache cache statistics of the $CVOL cached volume."
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echo 'cache_read_hits.type DERIVE'
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echo 'cache_read_hits.label Read hits'
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echo 'cache_read_hits.info Read hits for cache'
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echo 'cache_read_misses.type DERIVE'
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echo 'cache_read_misses.label Read misses'
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echo 'cache_read_misses.info Read misses for cache'
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echo 'cache_write_hits.type DERIVE'
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echo 'cache_write_hits.label Write hits'
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echo 'cache_write_hits.info Write hits for cache'
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echo 'cache_write_misses.type DERIVE'
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echo 'cache_write_misses.label Write misses'
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echo 'cache_write_misses.info Write misses for cache'
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echo 'cache_demotions.type DERIVE'
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echo 'cache_demotions.label Demotions'
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echo 'cache_demotions.info Demotions for cache'
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echo 'cache_promotions.type DERIVE'
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echo 'cache_promotions.label Promotions'
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echo 'cache_promotions.info Promotions for cache'
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exit 0
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;;
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esac
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dmstatus=$(dmsetup status $CVOL)
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echo "cache_read_hits.value $(echo $dmstatus | awk '{print $8}')"
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echo "cache_read_misses.value $(echo $dmstatus | awk '{print $9}')"
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echo "cache_write_hits.value $(echo $dmstatus | awk '{print $10}')"
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echo "cache_write_misses.value $(echo $dmstatus | awk '{print $11}')"
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echo "cache_demotions.value $(echo $dmstatus | awk '{print $12}')"
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echo "cache_promotions.value $(echo $dmstatus | awk '{print $13}')"
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