Disks Plugin

The DISKS plugin creates the DISKS table in the INFORMATION_SCHEMA database. This table shows metadata about disks on the system, enabling monitoring of the disk space status. Accessing the INFORMATION_SCHEMA.DISKS table requires the FILE privilege.

Installing the Plugin

Although the plugin's shared library is distributed with MariaDB by default, the plugin is not actually installed by MariaDB automatically. There are two methods that can be used to install the plugin with MariaDB.

The first method can be used to install the plugin without restarting the server. You can install the plugin dynamically by executing or :

The second method can be used to tell the server to load the plugin when it starts up. The plugin can be installed this way by providing the or the options. This can be provided as a command-line argument to or specified in a relevant server in an :

Example

After the plugin is installed, the INFORMATION_SCHEMA.DISKS table displays disk utilization information.

To view disk usage information, run the following query:

Example Output

Column Descriptions

The INFORMATION_SCHEMA.DISKS table contains the following columns:

• Disk: The name of the disk device or partition.

• Path: The mount point where the disk is mounted.

• Total: The total disk space available on the disk (in KiB).

• Used: The amount of disk space currently used (in KiB).

Note: As root users may have more available space than non-root users, Available + Used may be less than Total.

Additionally, all paths to which a specific disk is mounted are reported, so a disk may appear multiple times in the output.

Alternative: Mounts Table

As an alternative option, the plugin includes the INFORMATION_SCHEMA.MOUNTS table, which contains mount points and their respective disks.

For example:

Expected Output

Versions

Options

disks

• Description: Controls how the server should treat the plugin when the server starts up.

  • Valid values are:

    • OFF - Disables the plugin without removing it from the table.

Uninstalling the Plugin

You can uninstall the plugin dynamically by executing or :

If you installed the plugin by providing the or the options in a relevant server in an , then those options should be removed to prevent the plugin from being loaded the next time the server is restarted.

See Also

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