Quoting Stefan Priebe - Profihost AG (2013-03-21 04:03:04)
> Hi,
> 
> while copying a 15GB file to my btrfs volume i'm getting "No space left
> on device".
> 
> Some information:
> 
> # btrfs filesystem df /mnt/
> Data: total=18.14TB, used=15.05TB
> System, DUP: total=8.00MB, used=1.94MB
> System: total=4.00MB, used=0.00
> Metadata, DUP: total=23.98GB, used=17.97GB
> Metadata: total=8.00MB, used=0.00
> 
> # df -h
> Filesystem             Size  Used Avail Use% Mounted on
> /dev/mapper/raid54tb1   19T   16T  3,1T  84% /mnt
> 
> # btrfs fi show
> Label: none  uuid: fc23c4a8-a351-4c91-96a2-ee6abeffe59a
>         Total devices 1 FS bytes used 15.07TB
>         devid    1 size 18.19TB used 18.19TB path /dev/dm-3
> 
> # btrfs fi balance start -dusage=5 /mnt/
> Done, had to relocate 0 out of 18604 chunks
> 
> What wrong here? What is about the last 3TB?

Which kernel are you running?

-chris

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