On 2015-11-13 12:30, Vedran Vucic wrote:
Hello,

Here are outputs of commands as you requested:
  btrfs fi df /
Data, single: total=8.00GiB, used=7.71GiB
System, DUP: total=32.00MiB, used=16.00KiB
Metadata, DUP: total=1.12GiB, used=377.25MiB
GlobalReserve, single: total=128.00MiB, used=0.00B

btrfs fi show
Label: none  uuid: d6934db3-3ac9-49d0-83db-287be7b995a5
         Total devices 1 FS bytes used 8.08GiB
         devid    1 size 18.71GiB used 10.31GiB path /dev/sda6

btrfs-progs v4.0+20150429

Hmm, that's odd, based on these numbers, you should be having no issue at all trying to run a balance. You might be hitting some other bug in the kernel, however, but I don't remember if there were any known bugs related to ENOSPC or balance in the version you're running. You might see if trying to re-run the balance with '-dusage=40 -musage=40' works correctly (I've seen cases where the first run fails, but subsequent ones work because the first one made some progress despite failing).
On Fri, Nov 13, 2015 at 5:30 PM, Austin S Hemmelgarn
<ahferro...@gmail.com> wrote:
On 2015-11-13 11:12, Vedran Vucic wrote:

Hello,

I succeeded to delete illegal snapshot with command:
btrfs subvolume delete /.snapshots/741/snapshot
When I have done
btrfs balance / -dusage=0 -musage=0
increasing value up to 4o I did not have issues.
But on value 4- for-dusage= and -musage=
I got message that there is no space left on disk.
Do you have any advice how to manage that?


Can you post the output of 'btrfs fi df' and 'btrfs fi show' again? Both
should have changed after the balance, and I'd need to see what it looks
like now to be able to give any reasonable advice.




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