On Tue, 28 Jul 2015, Peter Ross <petrosssit@gmail.com> wrote:
> Russell Coker wrote:
> > Looks like you are running low on metadata space.  Run a balance to free
> > a data chunk.
>
> # btrfs balance /
> ERROR: error during balancing '/' - No space left on device
> There may be more info in syslog - try dmesg | tail
> [root@m-admin03 ~]# dmesg | tail
> ..
> [57720.728021] BTRFS info (device sda3): relocating block group 12582912
> flags 1
> [57721.462525] BTRFS info (device sda3): relocating block group 4194304
> flags 4
> [57722.195723] BTRFS info (device sda3): relocating block group 0 flags 2
> [57723.302220] BTRFS info (device sda3): 14 enospc errors during balance

Recent kernels have fixed most of those issues.  But the old kernel should be
OK as long as you have plenty of free space all the time.

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