Monitoring BTRFS

This article will help you get the Btrfs plugin for sd-agent configured and returning metrics

Installing the btrfs plugin package

Install the btrfs plugin on Debian/Ubuntu:

sudo apt-get install sd-agent-btrfs

Install the btrfs plugin on RHEL/CentOS:

sudo yum install sd-agent-btrfs

Read more about agent plugins.

Configuring the agent to monitor Btrfs

1. Configure /etc/sd-agent/conf.d/btrfs.yaml

init_config:

instances:
- excluded_devices: [] # List of devices to exclude
  • Optional: if you wish to exclude devices, add them to excluded_devices

2. Restart the agent

sudo /etc/init.d/sd-agent restart

or

sudo systemctl restart sd-agent

Verifying the configuration
Execute info to verify the configuration with the following:

sudo /etc/init.d/sd-agent info 

or

/usr/share/python/sd-agent/agent.py info

If the agent has been configured correctly you'll see an output such as:

btrfs
-----
  - instance #0 [OK]
  - Collected * metrics

You can also view the metrics returned with the following command:

sudo -u sd-agent /usr/share/python/sd-agent/agent.py check btrfs

Configuring graphs

Click the name of your server from the Devices list in your Server Density account then go to the Metrics tab. Click the + Graph button on the right then choose the btrfs metrics to display the graphs. The metrics will also be available to select when building dashboard graphs.

Screen_Shot_2018-01-18_at_11.46.12.png

Monitored metrics

MetricValues
system.disk.btrfs.free

The free space on a device
byte / None
Type: float
system.disk.btrfs.total

The total amount of space on a device
byte / None
Type: float
system.disk.btrfs.usage

The amount of space used on a device as a fraction of the total
fraction / None
Type: float
system.disk.btrfs.used

The used space on a device
byte / None
Type: float

Metrics Conversion

Please refer to the metrics conversion document to map old metrics names to the new metric names.

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