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description

tags

introduced

os_support

Telegraf plugin for collecting metrics from Device Mapper Cache

telegraf_v1_ref

parent	name	identifier
input_plugins_reference	Device Mapper Cache	input-dmcache

Device Mapper Cache

input-plugins

configuration

system

v1.3.0

linux

/telegraf/v1/configure_plugins/

https://github.com/influxdata/telegraf/tree/v1.37.2/plugins/inputs/dmcache/README.md, Device Mapper Cache Plugin Source

Device Mapper Cache Input Plugin

This plugin provide a native collection for dmsetup based statistics for dm-cache.

[!NOTE] This plugin requires super-user permissions! Please make sure, Telegraf is able to run sudo /sbin/dmsetup status --target cache without requiring a password.

Introduced in: Telegraf v1.3.0 Tags: system OS support: linux

Global configuration options

Plugins support additional global and plugin configuration settings for tasks such as modifying metrics, tags, and fields, creating aliases, and configuring plugin ordering. See CONFIGURATION.md for more details.

Configuration

# Provide a native collection for dmsetup based statistics for dm-cache
# This plugin ONLY supports Linux
[[inputs.dmcache]]
  ## Whether to report per-device stats or not
  per_device = true

Metrics

dmcache
- length
- target
- metadata_blocksize
- metadata_used
- metadata_total
- cache_blocksize
- cache_used
- cache_total
- read_hits
- read_misses
- write_hits
- write_misses
- demotions
- promotions
- dirty

Example Output

dmcache,device=example cache_blocksize=0i,read_hits=995134034411520i,read_misses=916807089127424i,write_hits=195107267543040i,metadata_used=12861440i,write_misses=563725346013184i,promotions=3265223720960i,dirty=0i,metadata_blocksize=0i,cache_used=1099511627776ii,cache_total=0i,length=0i,metadata_total=1073741824i,demotions=3265223720960i 1491482035000000000

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