SSD or SAN

!!!!!! DONT

Convert duplicated system data, metadata and data to single copy only:

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 /

Convert metadata and system data to 2 copies even if on SSD/NVM/SAN:

btrfs balance start -v -mconvert=dup -sconvert=dup / -f