dmcache

README

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

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

Documentation

Index

• type DMCache
  • func (c *DMCache) Gather(acc telegraf.Accumulator) error
  • func (*DMCache) SampleConfig() string

Types

type DMCache

type DMCache struct {
	PerDevice bool `toml:"per_device"`
	// contains filtered or unexported fields
}

func (*DMCache) Gather

func (c *DMCache) Gather(acc telegraf.Accumulator) error

func (*DMCache) SampleConfig

func (*DMCache) SampleConfig() string