hello,
On 08/13/2016 01:36 AM, Ronan Arraes Jardim Chagas wrote:
Hi guys,
I'm facing a daily problem with BTRFS. Almost everyday, I get the
message "No space left on device". Sometimes I can recover by balancing
the system but sometimes even balancing does not work due to the lack
of space. In this case, only a hard reset works if I can't delete some
files. The problem is that I have a huge unallocated space as you can
see here:
# btrfs fi usage /
Overall:
Device size: 1.26TiB
Device allocated: 119.07GiB
Device unallocated: 1.14TiB
Device missing: 0.00B
Used: 115.08GiB
Free (estimated): 1.14TiB (min: 586.21GiB)
Data ratio: 1.00
Metadata ratio: 2.00
Global reserve: 512.00MiB (used: 0.00B)
Data,single: Size:113.01GiB, Used:111.19GiB
/dev/sda6 113.01GiB
Metadata,DUP: Size:3.00GiB, Used:1.94GiB
/dev/sda6 6.00GiB
System,DUP: Size:32.00MiB, Used:16.00KiB
/dev/sda6 64.00MiB
Unallocated:
/dev/sda6 1.14TiB
It is not easy to trigger the problem. But I do find some correlation
between two things:
1) When I started to create jails to build openSUSE packages locally,
then the problem happens more often. In these jails, some directories
like /dev/, /dev/pts, /proc, are mounted inside the jail.
2) When I open my KVM, I also see this problem more often. Notice,
however, that the KVM disk is stored in another EXT4 partition.
I would be glad if anyone can help me to fix it. In the following, I'm
providing more information about my system:
# uname -a
Linux ronanarraes-osd 4.7.0-1-default #1 SMP PREEMPT Mon Jul 25
08:42:47 UTC 2016 (89a2ada) x86_64 x86_64 x86_64 GNU/Linux
# btrfs --version
btrfs-progs v4.6.1+20160714
# btrfs fi show
Label: none uuid: 80381f7f-8cef-4bd8-bdbc-3487253ee566
Total devices 1 FS bytes used 113.13GiB
devid 1 size 1.26TiB used 119.07GiB path /dev/sda6
# btrfs fi df /
Data, single: total=113.01GiB, used=111.19GiB
System, DUP: total=32.00MiB, used=16.00KiB
Metadata, DUP: total=3.00GiB, used=1.94GiB
GlobalReserve, single: total=512.00MiB, used=0.00B
When strange ENOSPC errors occur, I think "btrfs fi usage"
or "btrfs di df" do not help too much. Their output do not
reflect btrfs kernel current status :)
Would you please provide attribute files' values in
/sys/fs/btrfs/$UUID/allocation/data
and /sys/fs/btrfs/$UUID/allocation/metadata when ENOSPC error occurs.
Regards,
Xiaoguang Wang
Regards,
Ronan Arraes
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