btrfs balance

Balance block groups on a btrfs filesystem. More information: https://btrfs.readthedocs.io/en/latest/btrfs-balance.html.

• Show the status of a running or paused balance operation:

sudo btrfs balance status path/to/btrfs_filesystem

• Balance all block groups (slow; rewrites all blocks in filesystem):

sudo btrfs balance start path/to/btrfs_filesystem

• Balance data block groups which are less than 15% utilized, running the operation in the background:

sudo btrfs balance start --bg -dusage=15 path/to/btrfs_filesystem

• Balance a max of 10 metadata chunks with less than 20% utilization and at least 1 chunk on a given device devid (see btrfs filesystem show):

sudo btrfs balance start -musage=20,limit=10,devid=devid path/to/btrfs_filesystem

• Convert data blocks to the raid6 and metadata to raid1c3 (see mkfs.btrfs(8) for profiles):

sudo btrfs balance start -dconvert=raid6 -mconvert=raid1c3 path/to/btrfs_filesystem

• Convert data blocks to raid1, skipping already converted chunks (e.g. after a previous cancelled conversion operation):

sudo btrfs balance start -dconvert=raid1,soft path/to/btrfs_filesystem

• Cancel, pause, or resume a running or paused balance operation:

sudo btrfs balance cancel|pause|resume path/to/btrfs_filesystem