Re: No space left on device

[Leonidas Spyropoulos <artafinde@gmail.com>]

On 12/02/2014 09:51, Jakob Truelsen wrote:
> Hello. I am experiencing "No space left on device" with a btrfs file
> system, yet I cannot seem to find any exhausted resource. Could some
> resource I do not know about be exhausted, or is this caused by
> something else. Below is a trace of information that might be usefull,
> please let me know if there is anything I can do to resolve the issue.
>
> /Jakob
>
> [jakobt@soda ~]$ uname -a
> Linux soda 3.12.8-1-ARCH #1 SMP PREEMPT Thu Jan 16 09:16:34 CET 2014
> x86_64 GNU/Linux
>
> [jakobt@soda ~]$ btrfs --version
> Btrfs v3.12
>
> [jakobt@soda ~]$ mount
> ...
> /dev/sda on /data type btrfs (rw,relatime,nospace_cache)
>
> [jakobt@soda ~]$ df /data
> Filesystem     1K-blocks     Used Available Use% Mounted on
> /dev/sdb2       76594224 49247368  23433028  68% /
>
> [jakobt@soda ~]$ btrfs filesystem df /data
> Data, single: total=1.82TiB, used=518.04GiB
> System, DUP: total=8.00MiB, used=204.00KiB
> System, single: total=4.00MiB, used=0.00
> Metadata, DUP: total=1.00GiB, used=767.70MiB
> Metadata, single: total=8.00MiB, used=0.00
>
> [jakobt@soda ~]$ touch /data/jakobt/hat
> touch: cannot touch ‘/data/jakobt/hat’: No space left on device
>
> [jakobt@soda ~]$ sudo btrfs fi balance start /data
> ERROR: error during balancing '/data' - No space left on device
> There may be more info in syslog - try dmesg | tail
>
> [jakobt@soda ~]$ dmesg | grep tail -n 2
> [1113177.878157] btrfs: device label Data devid 1 transid 44784 /dev/sda
> [1113507.641752] btrfs: 1866 enospc errors during balance
>
> [jakobt@soda ~]$ sudo umount /data
>
> [jakobt@soda ~]$ sudo btrfsck /dev/sda
> ...
> cache and super generation don't match, space cache will be invalidated
> ..
> found 172181366447 bytes used err is 0
> total csum bytes: 418841160
> total tree bytes: 805187584
> total fs tree bytes: 247164928
> total extent tree bytes: 26329088
> btree space waste bytes: 164771401
> file data blocks allocated: 561564688384
>   referenced 511759908864
> Btrfs v3.12
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Hello Jacob,

Have you tried balancing just the data/metadata chunks only?

Regards,
Leonidas