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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.

Configuration

[[inputs.dmcache]]
  ## Whether to report per-device stats or not
  per_device = true

Measurements & Fields:

  • 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:

$ ./telegraf --test --config /etc/telegraf/telegraf.conf --input-filter dmcache
* Plugin: inputs.dmcache, Collection 1
> 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