Information Schema DISKS Table

MariaDB 10.1.32

The DISKS table was introduced in MariaDB 10.1.32, MariaDB 10.2.14, and MariaDB 10.3.6 as part of the DISKS plugin.

Description

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

This plugin does not check user privileges. When it is enabled, any user can query the INFORMATION_SCHEMA.DISKS table and see all the information it provides. See MDEV-18328 about that.

As of the first version, the plugin only works on Linux.

The table contains the following columns:

ColumnDescription
DISKName of the disk itself.
PATHMount point of the disk.
TOTALTotal space in KiB.
USEDUsed amount of space in KiB.
AVAILABLEAmount 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

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