In June 2013, I reformatted my disk drive as btrfs. From June to October no problem. Then about 2 weeks ago, I get a boot time message about the / being nearly full. Usually the amount of free space being reported is under a gig. As I keep /home on it's own partition, and / on it's own partition, and the / partition is 18 gig, I knew this message to be inaccurate. I have put the output of: sudo du -schx /* -- and other relevant information, e.g., fstab, at http://paste.ubuntu.com/6246498/ there you can see that /home is in / and /home uses 85 gig. I read HaraldWeber's post about how to fix the problem at: http://ubuntuforums.org/archive/index.php/t-2003556.html but I'm not able to understand enough to do what he did. Then I found your http://www.howtoforge.com/a-beginners-guide-to-btrfs and that helped but I have a few question remaining. Harald Weber said: "Boot from a live usb drive. Make two subvolumes, @ and @home like in my post, on your big volume (i call it /dev/sda5 here). These subvolumes appears as simple directories in /dev/sda5. Copy your root partition to @ (don't copy the subvolumes and your home directory). Move /home to @home (take care to not copy the @ subvolume too)" I plead for some help with the command structure of this. I am not a programmer, only an end user.