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DMCache Input Plugin

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

This plugin requires sudo, that is why you should setup and be sure that the telegraf is able to execute sudo without a password.

sudo /sbin/dmsetup status --target cache is the full command that telegraf will run for debugging purposes.

Global configuration options

In addition to the plugin-specific configuration settings, plugins support additional global and plugin configuration settings. These settings are used to modify metrics, tags, and field or create aliases and configure ordering, etc. See the 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