# devstat
Plugin: freebsd.plugin
Module: devstat
## Overview
Collect information per hard disk available on host.
The plugin calls `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.
## 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 devstat instance
These metrics give a general vision about I/O events on disks.
This scope has no labels.
Metrics:
| Metric | Dimensions | Unit |
|:------|:----------|:----|
| system.io | io, out | KiB/s |
### Per disk
This scope has no labels.
Metrics:
| Metric | Dimensions | Unit |
|:------|:----------|:----|
| disk.io | reads, writes, frees | KiB/s |
| disk.ops | reads, writes, other, frees | operations/s |
| disk.qops | operations | operations |
| disk.util | utilization | % of time working |
| disk.iotime | reads, writes, other, frees | milliseconds/s |
| disk.await | reads, writes, other, frees | milliseconds/operation |
| disk.avgsz | reads, writes, frees | KiB/operation |
| disk.svctm | svctm | milliseconds/operation |
## Alerts
The following alerts are available:
| Alert name | On metric | Description |
|:------------|:----------|:------------|
| [ 10min_disk_utilization ](https://github.com/netdata/netdata/blob/master/health/health.d/disks.conf) | disk.util | average percentage of time ${label:device} disk was busy over the last 10 minutes |
## 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:kern.devstat]` section within that file.
The file format is a modified INI syntax. The general structure is:
```ini
[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](https://github.com/netdata/netdata/blob/master/docs/configure/nodes.md#the-netdata-config-directory).
```bash
cd /etc/netdata 2>/dev/null || cd /opt/netdata/etc/netdata
sudo ./edit-config netdata.conf
```
#### Options
Config options
| Name | Description | Default | Required |
|:----|:-----------|:-------|:--------:|
| enable new disks detected at runtime | Enable or disable possibility to detect new disks. | auto | False |
| performance metrics for pass devices | Enable or disable metrics for disks with type `PASS`. | auto | False |
| total bandwidth for all disks | Enable or disable total bandwidth metric for all disks. | yes | False |
| bandwidth for all disks | Enable or disable bandwidth for all disks metric. | auto | False |
| operations for all disks | Enable or disable operations for all disks metric. | auto | False |
| queued operations for all disks | Enable or disable queued operations for all disks metric. | auto | False |
| utilization percentage for all disks | Enable or disable utilization percentage for all disks metric. | auto | False |
| i/o time for all disks | Enable or disable I/O time for all disks metric. | auto | False |
| average completed i/o time for all disks | Enable or disable average completed I/O time for all disks metric. | auto | False |
| average completed i/o bandwidth for all disks | Enable or disable average completed I/O bandwidth for all disks metric. | auto | False |
| average service time for all disks | Enable or disable average service time for all disks metric. | auto | False |
| disable by default disks matching | Do not create charts for disks listed. | | False |