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telegraf/plugins/inputs/zfs/README.md
Zack Zatkin-Gold dd537b3382 Fix telegraf example arguments (#2788) 
Many of the examples provided within documentation are using a single
dash for the command line arguments, but the telegraf executable
explicitly has two dashes.

There are also some inconsistencies with the ordering of the command
line argument examples.  I've ordered them so that the examples will
show: config, config-directory, input-filter, test
2017-05-12 15:22:29 -07:00

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# ZFS plugin
This ZFS plugin provides metrics from your ZFS filesystems. It supports ZFS on
Linux and FreeBSD. It gets ZFS stat from `/proc/spl/kstat/zfs` on Linux and
from `sysctl` and `zpool` on FreeBSD.
### Configuration:
```toml
[[inputs.zfs]]
## ZFS kstat path. Ignored on FreeBSD
## If not specified, then default is:
# kstatPath = "/proc/spl/kstat/zfs"
## By default, telegraf gather all zfs stats
## If not specified, then default is:
# kstatMetrics = ["arcstats", "zfetchstats", "vdev_cache_stats"]
## By default, don't gather zpool stats
# poolMetrics = false
```
### Measurements & Fields:
By default this plugin collects metrics about **Arc**, **Zfetch**, and
**Vdev cache**. All these metrics are either counters or measure sizes
in bytes. These metrics will be in the `zfs` measurement with the field
names listed bellow.
If `poolMetrics` is enabled then additional metrics will be gathered for
each pool.
- zfs
With fields listed bellow.
#### Arc Stats
- arcstats_allocated (FreeBSD only)
- arcstats_anon_evict_data (Linux only)
- arcstats_anon_evict_metadata (Linux only)
- arcstats_anon_evictable_data (FreeBSD only)
- arcstats_anon_evictable_metadata (FreeBSD only)
- arcstats_anon_size
- arcstats_arc_loaned_bytes (Linux only)
- arcstats_arc_meta_limit
- arcstats_arc_meta_max
- arcstats_arc_meta_min (FreeBSD only)
- arcstats_arc_meta_used
- arcstats_arc_no_grow (Linux only)
- arcstats_arc_prune (Linux only)
- arcstats_arc_tempreserve (Linux only)
- arcstats_c
- arcstats_c_max
- arcstats_c_min
- arcstats_data_size
- arcstats_deleted
- arcstats_demand_data_hits
- arcstats_demand_data_misses
- arcstats_demand_hit_predictive_prefetch (FreeBSD only)
- arcstats_demand_metadata_hits
- arcstats_demand_metadata_misses
- arcstats_duplicate_buffers
- arcstats_duplicate_buffers_size
- arcstats_duplicate_reads
- arcstats_evict_l2_cached
- arcstats_evict_l2_eligible
- arcstats_evict_l2_ineligible
- arcstats_evict_l2_skip (FreeBSD only)
- arcstats_evict_not_enough (FreeBSD only)
- arcstats_evict_skip
- arcstats_hash_chain_max
- arcstats_hash_chains
- arcstats_hash_collisions
- arcstats_hash_elements
- arcstats_hash_elements_max
- arcstats_hdr_size
- arcstats_hits
- arcstats_l2_abort_lowmem
- arcstats_l2_asize
- arcstats_l2_cdata_free_on_write
- arcstats_l2_cksum_bad
- arcstats_l2_compress_failures
- arcstats_l2_compress_successes
- arcstats_l2_compress_zeros
- arcstats_l2_evict_l1cached (FreeBSD only)
- arcstats_l2_evict_lock_retry
- arcstats_l2_evict_reading
- arcstats_l2_feeds
- arcstats_l2_free_on_write
- arcstats_l2_hdr_size
- arcstats_l2_hits
- arcstats_l2_io_error
- arcstats_l2_misses
- arcstats_l2_read_bytes
- arcstats_l2_rw_clash
- arcstats_l2_size
- arcstats_l2_write_buffer_bytes_scanned (FreeBSD only)
- arcstats_l2_write_buffer_iter (FreeBSD only)
- arcstats_l2_write_buffer_list_iter (FreeBSD only)
- arcstats_l2_write_buffer_list_null_iter (FreeBSD only)
- arcstats_l2_write_bytes
- arcstats_l2_write_full (FreeBSD only)
- arcstats_l2_write_in_l2 (FreeBSD only)
- arcstats_l2_write_io_in_progress (FreeBSD only)
- arcstats_l2_write_not_cacheable (FreeBSD only)
- arcstats_l2_write_passed_headroom (FreeBSD only)
- arcstats_l2_write_pios (FreeBSD only)
- arcstats_l2_write_spa_mismatch (FreeBSD only)
- arcstats_l2_write_trylock_fail (FreeBSD only)
- arcstats_l2_writes_done
- arcstats_l2_writes_error
- arcstats_l2_writes_hdr_miss (Linux only)
- arcstats_l2_writes_lock_retry (FreeBSD only)
- arcstats_l2_writes_sent
- arcstats_memory_direct_count (Linux only)
- arcstats_memory_indirect_count (Linux only)
- arcstats_memory_throttle_count
- arcstats_meta_size (Linux only)
- arcstats_mfu_evict_data (Linux only)
- arcstats_mfu_evict_metadata (Linux only)
- arcstats_mfu_ghost_evict_data (Linux only)
- arcstats_mfu_ghost_evict_metadata (Linux only)
- arcstats_metadata_size (FreeBSD only)
- arcstats_mfu_evictable_data (FreeBSD only)
- arcstats_mfu_evictable_metadata (FreeBSD only)
- arcstats_mfu_ghost_evictable_data (FreeBSD only)
- arcstats_mfu_ghost_evictable_metadata (FreeBSD only)
- arcstats_mfu_ghost_hits
- arcstats_mfu_ghost_size
- arcstats_mfu_hits
- arcstats_mfu_size
- arcstats_misses
- arcstats_mru_evict_data (Linux only)
- arcstats_mru_evict_metadata (Linux only)
- arcstats_mru_ghost_evict_data (Linux only)
- arcstats_mru_ghost_evict_metadata (Linux only)
- arcstats_mru_evictable_data (FreeBSD only)
- arcstats_mru_evictable_metadata (FreeBSD only)
- arcstats_mru_ghost_evictable_data (FreeBSD only)
- arcstats_mru_ghost_evictable_metadata (FreeBSD only)
- arcstats_mru_ghost_hits
- arcstats_mru_ghost_size
- arcstats_mru_hits
- arcstats_mru_size
- arcstats_mutex_miss
- arcstats_other_size
- arcstats_p
- arcstats_prefetch_data_hits
- arcstats_prefetch_data_misses
- arcstats_prefetch_metadata_hits
- arcstats_prefetch_metadata_misses
- arcstats_recycle_miss (Linux only)
- arcstats_size
- arcstats_sync_wait_for_async (FreeBSD only)
#### Zfetch Stats
- zfetchstats_bogus_streams (Linux only)
- zfetchstats_colinear_hits (Linux only)
- zfetchstats_colinear_misses (Linux only)
- zfetchstats_hits
- zfetchstats_max_streams (FreeBSD only)
- zfetchstats_misses
- zfetchstats_reclaim_failures (Linux only)
- zfetchstats_reclaim_successes (Linux only)
- zfetchstats_streams_noresets (Linux only)
- zfetchstats_streams_resets (Linux only)
- zfetchstats_stride_hits (Linux only)
- zfetchstats_stride_misses (Linux only)
#### Vdev Cache Stats
- vdev_cache_stats_delegations
- vdev_cache_stats_hits
- vdev_cache_stats_misses
#### Pool Metrics (optional)
On Linux:
- zfs_pool
- nread (integer, )
- nwritten (integer, )
- reads (integer, )
- writes (integer, )
- wtime (integer, )
- wlentime (integer, )
- wupdate (integer, )
- rtime (integer, )
- rlentime (integer, )
- rupdate (integer, )
- wcnt (integer, )
- rcnt (integer, )
On FreeBSD:
- zfs_pool
- allocated (integer, bytes)
- capacity (integer, bytes)
- dedupratio (float, ratio)
- free (integer, bytes)
- size (integer, bytes)
- fragmentation (integer, percent)
### Tags:
- ZFS stats (`zfs`) will have the following tag:
- pools - A `::` concatenated list of all ZFS pools on the machine.
- Pool metrics (`zfs_pool`) will have the following tag:
- pool - with the name of the pool which the metrics are for.
- health - the health status of the pool. (FreeBSD only)
### Example Output:
```
$ ./telegraf --config telegraf.conf --input-filter zfs --test
* Plugin: zfs, Collection 1
> zfs_pool,health=ONLINE,pool=zroot allocated=1578590208i,capacity=2i,dedupratio=1,fragmentation=1i,free=64456531968i,size=66035122176i 1464473103625653908
> zfs,pools=zroot arcstats_allocated=4167764i,arcstats_anon_evictable_data=0i,arcstats_anon_evictable_metadata=0i,arcstats_anon_size=16896i,arcstats_arc_meta_limit=10485760i,arcstats_arc_meta_max=115269568i,arcstats_arc_meta_min=8388608i,arcstats_arc_meta_used=51977456i,arcstats_c=16777216i,arcstats_c_max=41943040i,arcstats_c_min=16777216i,arcstats_data_size=0i,arcstats_deleted=1699340i,arcstats_demand_data_hits=14836131i,arcstats_demand_data_misses=2842945i,arcstats_demand_hit_predictive_prefetch=0i,arcstats_demand_metadata_hits=1655006i,arcstats_demand_metadata_misses=830074i,arcstats_duplicate_buffers=0i,arcstats_duplicate_buffers_size=0i,arcstats_duplicate_reads=123i,arcstats_evict_l2_cached=0i,arcstats_evict_l2_eligible=332172623872i,arcstats_evict_l2_ineligible=6168576i,arcstats_evict_l2_skip=0i,arcstats_evict_not_enough=12189444i,arcstats_evict_skip=195190764i,arcstats_hash_chain_max=2i,arcstats_hash_chains=10i,arcstats_hash_collisions=43134i,arcstats_hash_elements=2268i,arcstats_hash_elements_max=6136i,arcstats_hdr_size=565632i,arcstats_hits=16515778i,arcstats_l2_abort_lowmem=0i,arcstats_l2_asize=0i,arcstats_l2_cdata_free_on_write=0i,arcstats_l2_cksum_bad=0i,arcstats_l2_compress_failures=0i,arcstats_l2_compress_successes=0i,arcstats_l2_compress_zeros=0i,arcstats_l2_evict_l1cached=0i,arcstats_l2_evict_lock_retry=0i,arcstats_l2_evict_reading=0i,arcstats_l2_feeds=0i,arcstats_l2_free_on_write=0i,arcstats_l2_hdr_size=0i,arcstats_l2_hits=0i,arcstats_l2_io_error=0i,arcstats_l2_misses=0i,arcstats_l2_read_bytes=0i,arcstats_l2_rw_clash=0i,arcstats_l2_size=0i,arcstats_l2_write_buffer_bytes_scanned=0i,arcstats_l2_write_buffer_iter=0i,arcstats_l2_write_buffer_list_iter=0i,arcstats_l2_write_buffer_list_null_iter=0i,arcstats_l2_write_bytes=0i,arcstats_l2_write_full=0i,arcstats_l2_write_in_l2=0i,arcstats_l2_write_io_in_progress=0i,arcstats_l2_write_not_cacheable=380i,arcstats_l2_write_passed_headroom=0i,arcstats_l2_write_pios=0i,arcstats_l2_write_spa_mismatch=0i,arcstats_l2_write_trylock_fail=0i,arcstats_l2_writes_done=0i,arcstats_l2_writes_error=0i,arcstats_l2_writes_lock_retry=0i,arcstats_l2_writes_sent=0i,arcstats_memory_throttle_count=0i,arcstats_metadata_size=17014784i,arcstats_mfu_evictable_data=0i,arcstats_mfu_evictable_metadata=16384i,arcstats_mfu_ghost_evictable_data=5723648i,arcstats_mfu_ghost_evictable_metadata=10709504i,arcstats_mfu_ghost_hits=1315619i,arcstats_mfu_ghost_size=16433152i,arcstats_mfu_hits=7646611i,arcstats_mfu_size=305152i,arcstats_misses=3676993i,arcstats_mru_evictable_data=0i,arcstats_mru_evictable_metadata=0i,arcstats_mru_ghost_evictable_data=0i,arcstats_mru_ghost_evictable_metadata=80896i,arcstats_mru_ghost_hits=324250i,arcstats_mru_ghost_size=80896i,arcstats_mru_hits=8844526i,arcstats_mru_size=16693248i,arcstats_mutex_miss=354023i,arcstats_other_size=34397040i,arcstats_p=4172800i,arcstats_prefetch_data_hits=0i,arcstats_prefetch_data_misses=0i,arcstats_prefetch_metadata_hits=24641i,arcstats_prefetch_metadata_misses=3974i,arcstats_size=51977456i,arcstats_sync_wait_for_async=0i,vdev_cache_stats_delegations=779i,vdev_cache_stats_hits=323123i,vdev_cache_stats_misses=59929i,zfetchstats_hits=0i,zfetchstats_max_streams=0i,zfetchstats_misses=0i 1464473103634124908
```
### Description
A short description for some of the metrics.
#### Arc Stats
`arcstats_hits` Total amount of cache hits in the arc.
`arcstats_misses` Total amount of cache misses in the arc.
`arcstats_demand_data_hits` Amount of cache hits for demand data, this is what matters (is good) for your application/share.
`arcstats_demand_data_misses` Amount of cache misses for demand data, this is what matters (is bad) for your application/share.
`arcstats_demand_metadata_hits` Amount of cache hits for demand metadata, this matters (is good) for getting filesystem data (ls,find,…)
`arcstats_demand_metadata_misses` Amount of cache misses for demand metadata, this matters (is bad) for getting filesystem data (ls,find,…)
`arcstats_prefetch_data_hits` The zfs prefetcher tried to prefetch something, but it was already cached (boring)
`arcstats_prefetch_data_misses` The zfs prefetcher prefetched something which was not in the cache (good job, could become a demand hit in the future)
`arcstats_prefetch_metadata_hits` Same as above, but for metadata
`arcstats_prefetch_metadata_misses` Same as above, but for metadata
`arcstats_mru_hits` Cache hit in the “most recently used cache”, we move this to the mfu cache.
`arcstats_mru_ghost_hits` Cache hit in the “most recently used ghost list” we had this item in the cache, but evicted it, maybe we should increase the mru cache size.
`arcstats_mfu_hits` Cache hit in the “most frequently used cache” we move this to the beginning of the mfu cache.
`arcstats_mfu_ghost_hits` Cache hit in the “most frequently used ghost list” we had this item in the cache, but evicted it, maybe we should increase the mfu cache size.
`arcstats_allocated` New data is written to the cache.
`arcstats_deleted` Old data is evicted (deleted) from the cache.
`arcstats_evict_l2_cached` We evicted something from the arc, but its still cached in the l2 if we need it.
`arcstats_evict_l2_eligible` We evicted something from the arc, and it’s not in the l2 this is sad. (maybe we hadn’t had enough time to store it there)
`arcstats_evict_l2_ineligible` We evicted something which cannot be stored in the l2.
Reasons could be:
- We have multiple pools, we evicted something from a pool whithout an l2 device.
- The zfs property secondary cache.
`arcstats_c` Arc target size, this is the size the system thinks the arc should have.
`arcstats_size` Total size of the arc.
`arcstats_l2_hits` Hits to the L2 cache. (It was not in the arc, but in the l2 cache)
`arcstats_l2_misses` Miss to the L2 cache. (It was not in the arc, and not in the l2 cache)
`arcstats_l2_size` Size of the l2 cache.
`arcstats_l2_hdr_size` Size of the metadata in the arc (ram) used to manage (lookup if something is in the l2) the l2 cache.
#### Zfetch Stats
`zfetchstats_hits` Counts the number of cache hits, to items which are in the cache because of the prefetcher.
`zfetchstats_colinear_hits` Counts the number of cache hits, to items which are in the cache because of the prefetcher (prefetched linear reads)
`zfetchstats_stride_hits` Counts the number of cache hits, to items which are in the cache because of the prefetcher (prefetched stride reads)
#### Vdev Cache Stats
`vdev_cache_stats_hits` Hits to the vdev (device level) cache.
`vdev_cache_stats_misses` Misses to the vdev (device level) cache.
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