Dear all,
I cannot understand two messages in syslog, could someone please shed
some light? Here they are:
Apr 29 08:54:03 container-name kernel: [792742.662375] BTRFS warning
(device sda7): block group 181491728384 has wrong amount of free space
Apr 29 08:54:03 container-name kernel: [792742.662381] BTRFS warning
(device sda7): failed to load free space cache for block group
181491728384, rebuilding it now
Especially strange is the fact that messages appear in LXC container's
syslog, but not in syslog of a host system. I only saw network and
apparmor-related messages in container syslogs before.
I didn't run any usermode btrfs tools at the time (especially in
container, since they are not even installed there), but there's a quota
set for this subvolume, and it was coming close to exhausting by large
mysql database. There're no snapshots this time. smartmon finds no problems.
marat@host:~$ uname -a
Linux host 4.4.0-72-generic #93-Ubuntu SMP Fri Mar 31 14:07:41 UTC
2017 x86_64 x86_64 x86_64 GNU/Linux
marat@host:~$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 16.04.2 LTS
Release: 16.04
Codename: xenial
marat@host:~$ btrfs --version
btrfs-progs v4.4
marat@host:~$ sudo btrfs qgroup show -F -pcre
/mnt/lxc/container-name/rootfs
qgroupid rfer excl max_rfer max_excl parent child
-------- ---- ---- -------- -------- ------ -----
0/802 63.93GiB 63.93GiB 64.00GiB none --- ---
marat@host:~$ sudo btrfs filesystem show /dev/sda7 # run after freeing
space by clearing database
Label: 'data' uuid: 37d3313a-e2ad-4b7f-98fc-a01d815952e0
Total devices 2 FS bytes used 47.73GiB
devid 1 size 2.71TiB used 114.01GiB path /dev/sda7
devid 2 size 2.71TiB used 114.01GiB path /dev/sdb7
marat@host:~$ sudo btrfs filesystem df /mnt/lxc/container-name/rootfs#
run after freeing space by clearing database
Data, RAID1: total=111.00GiB, used=46.83GiB
System, RAID1: total=8.00MiB, used=32.00KiB
Metadata, RAID1: total=3.00GiB, used=983.11MiB
GlobalReserve, single: total=336.00MiB, used=0.00B
marat@host:~$ sudo lxc-attach -n container-name cat /proc/mounts |
grep sda7
/dev/sda7 / btrfs
rw,relatime,space_cache,subvolid=802,subvol=/lxc/container-name/rootfs 0 0
--
With Best Regards,
Marat Khalili
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