tldr/pages/linux/btrfs-device.md

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# btrfs device
> Manage devices in a btrfs filesystem.
> More information: <https://btrfs.wiki.kernel.org/index.php/Manpage/btrfs-device>.
- Add one or more devices to a btrfs filesystem:
`sudo btrfs device add {{path/to/block_device1}} [{{path/to/block_device2}}] {{path/to/btrfs_filesystem}}`
- Remove a device from a btrfs filesystem:
`sudo btrfs device remove {{path/to/device|device_id}} [{{...}}]`
- Display error statistics:
`sudo btrfs device stats {{path/to/btrfs_filesystem}}`
- Scan all disks and inform the kernel of all detected btrfs filesystems:
`sudo btrfs device scan --all-devices`
- Display detailed per-disk allocation statistics:
`sudo btrfs device usage {{path/to/btrfs_filesystem}}`