zfs
zfs
Plugin: freebsd.plugin Module: zfs
Overview
Collect metrics for ZFS filesystem
The plugin uses sysctl function to collect necessary data.
This collector is supported on all platforms.
This collector supports collecting metrics from multiple instances of this integration, including remote instances.
Default Behavior
Auto-Detection
This integration doesn’t support auto-detection.
Limits
The default configuration for this integration does not impose any limits on data collection.
Performance Impact
The default configuration for this integration is not expected to impose a significant performance impact on the system.
Setup
Prerequisites
No action required.
Configuration
File
The configuration file name for this integration is netdata.conf.
Configuration for this specific integration is located in the [plugin:freebsd:zfs_arcstats] section within that file.
The file format is a modified INI syntax. The general structure is:
[section1]
option1 = some value
option2 = some other value
[section2]
option3 = some third value
You can edit the configuration file using the edit-config script from the
Netdata config directory.
cd /etc/netdata 2>/dev/null || cd /opt/netdata/etc/netdata
sudo ./edit-config netdata.conf
Options
| Name | Description | Default | Required |
|---|---|---|---|
| show zero charts | Do not show charts with zero metrics. | no | no |
Examples
There are no configuration examples.
Metrics
Metrics grouped by scope.
The scope defines the instance that the metric belongs to. An instance is uniquely identified by a set of labels.
Per zfs instance
These metrics show detailed information about ZFS filesystem.
This scope has no labels.
Metrics:
| Metric | Dimensions | Unit |
|---|---|---|
| zfs.arc_size | arcsz, target, min, max | MiB |
| zfs.l2_size | actual, size | MiB |
| zfs.reads | arc, demand, prefetch, metadata, l2 | reads/s |
| zfs.bytes | read, write | KiB/s |
| zfs.hits | hits, misses | percentage |
| zfs.hits_rate | hits, misses | events/s |
| zfs.dhits | hits, misses | percentage |
| zfs.dhits_rate | hits, misses | events/s |
| zfs.phits | hits, misses | percentage |
| zfs.phits_rate | hits, misses | events/s |
| zfs.mhits | hits, misses | percentage |
| zfs.mhits_rate | hits, misses | events/s |
| zfs.l2hits | hits, misses | percentage |
| zfs.l2hits_rate | hits, misses | events/s |
| zfs.list_hits | mfu, mfu_ghost, mru, mru_ghost | hits/s |
| zfs.arc_size_breakdown | recent, frequent | percentage |
| zfs.memory_ops | throttled | operations/s |
| zfs.important_ops | evict_skip, deleted, mutex_miss, hash_collisions | operations/s |
| zfs.actual_hits | hits, misses | percentage |
| zfs.actual_hits_rate | hits, misses | events/s |
| zfs.demand_data_hits | hits, misses | percentage |
| zfs.demand_data_hits_rate | hits, misses | events/s |
| zfs.prefetch_data_hits | hits, misses | percentage |
| zfs.prefetch_data_hits_rate | hits, misses | events/s |
| zfs.hash_elements | current, max | elements |
| zfs.hash_chains | current, max | chains |
| zfs.trim_bytes | TRIMmed | bytes |
| zfs.trim_requests | successful, failed, unsupported | requests |
Alerts
The following alerts are available:
| Alert name | On metric | Description |
|---|---|---|
| zfs_memory_throttle | zfs.memory_ops | number of times ZFS had to limit the ARC growth in the last 10 minutes |