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> Balance block groups on a btrfs filesystem.
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}
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