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Enter a command. For example: utmpdump, uuidgen, findfs, xmodmap.

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}}