I chose btrfs as the format of my /
filesystem in the Ubuntu 12.04 LTS installer. After the installation completed, I added compress=lzo
to the mount options in /etc/fstab
and rebooted.
Will the existing files be automatically compressed now, or must I explicitly do something to cause that to happen?
Best Answer
You will have to run
btrfs fi defragment
to force recompression of existing data. Otherwise, only new data will be compressed.From the FAQ: