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}}