Hello there,
I'm trying out btrfs on a machine we use to host a number of
containers. After a misbehaved process filled the partition allocated to
the containers, I decided to experiment with quotas to isolate the
containers from each other. But I've now run into an oddity with one of
the containers, which reports being out of space:
# btrfs qgroup limit 2000m 0/261 . && touch x
touch: cannot touch ‘x’: Disk quota exceeded
The strange thing is that it doesn't seem to be actually out of space:
# btrfs qgroup show -p -r -e /var | grep 261
0/261 1111810048 391114752 2097152000 0 ---
which pretty-printed is 1.04G rfer and 0.36G excl (perhaps the qgroup
show command could take an option to display in other units?)
I can only get it to allow me to start using it again if I go over 5808M:
# btrfs qgroup limit 5807m 0/261 . && rm -f x && touch x
rm: cannot remove ‘x’: Disk quota exceeded
# btrfs qgroup limit 5808m 0/261 . && rm -f x && touch x
#
Why specifically 5808 I'm not sure, but I binary searched until I got to
that number. Does anyone have a clue as to why that might be happening,
and perhaps what I'm missing?
For completeness, some details on the filesystem and system:
# btrfs fi show /var
Label: var uuid: 815b3280-e90f-483a-b244-1d2dfe9b6e67
Total devices 2 FS bytes used 31.48GiB
devid 1 size 80.00GiB used 55.91GiB path /dev/sda3
devid 2 size 80.00GiB used 55.91GiB path /dev/sdb3
root@riff:/var/lib/lxc/async-local-machine-2/rootfs# btrfs fi df /var
Data, RAID1: total=53.88GiB, used=30.45GiB
System, RAID1: total=32.00MiB, used=16.00KiB
Metadata, RAID1: total=2.00GiB, used=1.03GiB
# btrfs qgroup show -p -r -e /var
qgroupid rfer excl max_rfer max_excl parent
-------- ---- ---- -------- -------- ------
0/5 1486852096 1252569088 0 0 ---
0/259 727175168 104947712 0 5368709120 ---
0/261 1111810048 391114752 2097152000 0 ---
0/265 1255923712 442871808 0 5368709120 ---
0/271 831856640 333189120 0 5368709120 ---
0/274 498761728 22827008 0 5368709120 ---
0/283 7666098176 6691426304 10737418240 0 ---
0/288 1118441472 348901376 0 5368709120 ---
0/289 11134029824 10498187264 16106127360 0 ---
0/290 1412505600 694210560 10737418240 0 ---
0/292 1131053056 333373440 0 5368709120 ---
0/293 1258176512 401141760 0 5368709120 ---
0/306 1430532096 656773120 0 5368709120 ---
0/318 9309212672 8509857792 10737418240 0 ---
0/320 860209152 837406720 0 5368709120 ---
0/323 1167962112 469741568 0 5368709120 ---
# btrfs --version
Btrfs v3.12
# uname -a
Linux riff 3.13.0-43-generic #72-Ubuntu SMP Mon Dec 8 19:35:06 UTC 2014
x86_64 x86_64 x86_64 GNU/Linux
Thanks,
--
Christian Robottom Reis | [+55 16] 3376 0125 | http://async.com.br/~kiko
Async Open Source | [+55 16] 9 9112 6430 | http://launchpad.net/~kiko
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