Information Schema DISKS Table

Description

The DISKS table is created when the DISKS plugin is enabled, and shows metadata about disks on the system.

Before MariaDB 10.4.7, MariaDB 10.3.17, MariaDB 10.2.26 and MariaDB 10.1.41, this plugin did not check user privileges. When it is enabled, any user can query the INFORMATION_SCHEMA.DISKS table and see all the information it provides.

Since MariaDB 10.4.7, MariaDB 10.3.17, MariaDB 10.2.26 and MariaDB 10.1.41, it requires the FILE privilege.

The plugin only works on Linux.

The table contains the following columns:

Column	Description
Column	Description
DISK	Name of the disk itself.
PATH	Mount point of the disk.
TOTAL	Total space in KiB.
USED	Used amount of space in KiB.
AVAILABLE	Amount of space in KiB available to non-root users.

Note that as the amount of space available to root (OS user) may be more that what is available to non-root users, 'available' + 'used' may be less than 'total'.

All paths to which a particular disk has been mounted are reported. The rationale is that someone might want to take different action e.g. depending on which disk is relevant for a particular path. This leads to the same disk being reported multiple times.

Example

SELECT * FROM information_schema.DISKS;

+-----------+-------+----------+---------+-----------+
| Disk      | Path  | Total    | Used    | Available |
+-----------+-------+----------+---------+-----------+
| /dev/vda1 | /     | 26203116 | 2178424 |  24024692 |
| /dev/vda1 | /boot | 26203116 | 2178424 |  24024692 |
| /dev/vda1 | /etc  | 26203116 | 2178424 |  24024692 |
+-----------+-------+----------+---------+-----------+

See Also

• Disks Plugin for details on installing, options

• Plugin Overview for details on managing plugins.

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