BTRFS

Subvolumes

• Listing: btrfs subvolume list -s </srv>
• Deletion: btrfs subvolume delete </srv/lxc/website/snaps/snap1/rootfs>

Adapted from: Linux.com

Filesystem full due block issue

• See actual disk free/use (df/du) status: btrfs filesystem df </srv>
• Rebalance (free/trim) meta blocks btrfs balance start -musage=<0> </srv>
• Rebalance (free/trim) diskblocks: btrfs balance start -dusage=<0> </srv>

  Up the -usage in increments starting from 0 to 50 in increments of 5