====== SSD or SAN ======

Convert duplicated system data, metadata and data to single copy only:
<code bash>
btrfs device usage /

btrfs balance start -sconvert=single -mconvert=single -dconvert=single / -f
# OR if data is already in single mode
btrfs balance start -sconvert=single -mconvert=single / -f

btrfs device usage /
</code>