# MD RAID Statistics Input Plugin

This plugin gathers statistics about any [Linux MD RAID arrays][mdraid]
configured on the host by reading `/proc/mdstat`. For a full list of available
fields see the `/proc/mdstat` section of the [proc man page][man_proc]. For
details on the fields check the [mdstat wiki][mdstat_wiki].

⭐ Telegraf v1.20.0
🏷️ system
💻 linux

[mdraid]: https://docs.kernel.org/admin-guide/md.html
[man_proc]: http://man7.org/linux/man-pages/man5/proc.5.html
[mdstat_wiki]: https://raid.wiki.kernel.org/index.php/Mdstat

## Global configuration options <!-- @/docs/includes/plugin_config.md -->

Plugins support additional global and plugin configuration settings for tasks
such as modifying metrics, tags, and fields, creating aliases, and configuring
plugin ordering. See [CONFIGURATION.md][CONFIGURATION.md] for more details.

[CONFIGURATION.md]: ../../../docs/CONFIGURATION.md#plugins

## Configuration

```toml @sample.conf
# Get kernel statistics from /proc/mdstat
# This plugin ONLY supports Linux
[[inputs.mdstat]]
  ## Sets file path
  ## If not specified, then default is /proc/mdstat
  # file_name = "/proc/mdstat"
```

## Metrics

- `mdstat` metric
  - tags:
    - ActivityState (`active` or `inactive`)
    - Devices (comma separated list of devices that make up the array)
    - Name (name of the array)
  - fields:
    - BlocksSynced (if the array is rebuilding/checking, this is the count of
      blocks that have been scanned)
    - BlocksSyncedFinishTime (the expected finish time of the rebuild scan,
      listed in minutes remaining)
    - BlocksSyncedPct (the percentage of the rebuild scan left)
    - BlocksSyncedSpeed (the current speed the rebuild is running at, listed
      in K/sec)
    - BlocksTotal (the total count of blocks in the array)
    - DisksActive (the number of disks that are currently considered healthy
      in the array)
    - DisksFailed (the current count of failed disks in the array)
    - DisksSpare (the current count of "spare" disks in the array)
    - DisksTotal (total count of disks in the array)

## Example Output

```text
mdstat,ActivityState=active,Devices=sdm1\,sdn1,Name=md1 BlocksSynced=231299072i,BlocksSyncedFinishTime=0,BlocksSyncedPct=0,BlocksSyncedSpeed=0,BlocksTotal=231299072i,DisksActive=2i,DisksFailed=0i,DisksSpare=0i,DisksTotal=2i,DisksDown=0i 1617814276000000000
mdstat,ActivityState=active,Devices=sdm5\,sdn5,Name=md2 BlocksSynced=2996224i,BlocksSyncedFinishTime=0,BlocksSyncedPct=0,BlocksSyncedSpeed=0,BlocksTotal=2996224i,DisksActive=2i,DisksFailed=0i,DisksSpare=0i,DisksTotal=2i,DisksDown=0i 1617814276000000000
```
