tldr/pages/linux/btrfs-device.md

btrfs device

Manage devices in a btrfs filesystem. More information: https://btrfs.readthedocs.io/en/latest/btrfs-device.html.

• Add one or more devices to a btrfs filesystem:

sudo btrfs {{[d|device]}} {{[a|add]}} {{path/to/block_device1 path/to/block_device2 ...}} {{path/to/btrfs_filesystem}}

• Remove a device from a btrfs filesystem:

sudo btrfs {{[d|device]}} {{[rem|remove]}} {{path/to/device1|device_id1 path/to/device2|device_id2 ...}}

• Display error statistics:

sudo btrfs {{[d|device]}} {{[st|stats]}} {{path/to/btrfs_filesystem}}

• Scan all disks and inform the kernel of all detected btrfs filesystems:

sudo btrfs {{[d|device]}} {{[sc|scan]}} {{[-d|--all-devices]}}

• Display detailed per-disk allocation statistics:

sudo btrfs {{[d|device]}} {{[u|usage]}} {{path/to/btrfs_filesystem}}