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?
"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.
--
http://brentonchapin.no-ip.biz
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