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.

⭐ Telegraf v1.3.0 🏷️ system 💻 linux

Global configuration options <!-- @/docs/includes/plugin_config.md -->

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

Tags

• All measurements have the following tags:
  • device

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