On Fri, Nov 13, 2015 at 04:33:23PM -0600, Brenton Chapin wrote: > I was running Lubuntu 14.04 on btrfs with lzo compresssion on, with > the following partition scheme: > > sda5 232M /boot > sda6 16G / > sda7 104G /home > > (sda5 is ext4) > > I did 2 distribution upgrades, one after the other, to 15.04, then > 15.10, since the upgrade utility would not go directly to the latest > version. This process did a whole lot of reading and writing to the > root volume of course. Everything seems to be working, except most of > the free space I had on sda6 is gone. Was using about 4G, now df > reports that the usage is 12G. At first, I thought Lubuntu had not > removed old files, but I can't find anything old left behind. I began > to suspect btrfs, and checking, find that du shows only 4G used on > sda6. Where'd the other 8G go?
Do you have snapshots? Are you running snapper, for example? The other place that large amounts of space can go over an upgrade is in orphans -- files that are deleted, but still held open by processes, and which therefore can't be reclaimed until the process is restarted. I've been bitten by that one before. Hugo. > "btrfs fi df /" reports the following: > > Data, single: total=11.01GiB, used=10.58GiB > System, DUP: total=8.00MiB, used=16.00KiB > System, single: total=4.00MiB, used=0.00B > Metadata, DUP: total=1.00GiB, used=397.80MiB > Metadata, single: total=8.00MiB, used=0.00B > GlobalReserve, single: total=144.00MiB, used=0.00B > > "btrfs filesystem show /" gives: > > Label: none uuid: 4ea4ac08-ff37-4b51-b1a3-d8b21fd43ddd > Total devices 1 FS bytes used 10.97GiB > devid 1 size 15.02GiB used 13.04GiB path /dev/sda6 > > btrfs-progs v4.0 > > "du --max-depth=1 -h -x" on / shows: > > 29M ./etc > 0 ./media > 16M ./bin > 354M ./lib > 4.0K ./lib64 > 0 ./mnt > 160K ./root > 12M ./sbin > 0 ./srv > 4.0K ./tmp > 3.1G ./usr > 442M ./var > 0 ./cdrom > 3.8M ./lib32 > 3.9G . > > And of course df: > > /dev/sda6 16G 12G 2.5G 83% / > /dev/sda5 232M 53M 163M 25% /boot > /dev/sda7 104G 46G 57G 45% /home > > And mount: > > mount |grep sda > /dev/sda6 on / type btrfs > (rw,relatime,compress=lzo,space_cache,subvolid=257,subvol=/@) > /dev/sda5 on /boot type ext4 (rw,relatime,data=ordered) > /dev/sda7 on /home type btrfs > (rw,relatime,compress=lzo,space_cache,subvolid=257,subvol=/@home) > > uname -a > Linux ichor 4.2.0-18-generic #22-Ubuntu SMP Fri Nov 6 18:25:50 UTC > 2015 x86_64 x86_64 x86_64 GNU/Linux > > I can live with the situation, but recovering that space would be nice. -- Hugo Mills | Happiness is mandatory. Are you happy? hugo@... carfax.org.uk | http://carfax.org.uk/ | PGP: E2AB1DE4 | Paranoia
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