btrfs-device:tldr:514c8

The command "sudo btrfs device scan --all-devices" is used to scan all devices in a Btrfs filesystem.

Here is a breakdown of each component of the command:

• "sudo" is a command that allows you to execute a command as a superuser or administrator. It is used to gain the necessary privileges to perform administrative tasks.

• "btrfs" is a command-line utility for managing Btrfs (b-tree file system), a modern, copy-on-write file system for Linux.

• "device" is a sub-command of "btrfs" and is used to manage devices within a Btrfs filesystem.

• "scan" is a specific action performed by the "device" sub-command. It scans the devices to identify and gather information about them.

• "--all-devices" is an option/flag that specifies that the scan should be conducted on all available devices in the Btrfs file system, rather than just a specific device. This includes both mounted and unmounted devices.

By running this command with administrative privileges, you tell the Btrfs utility to scan all devices in the Btrfs filesystem and gather information about them, such as their status, health, and available space. This information is useful for managing and troubleshooting a Btrfs setup.