Hi Chris,

On Sun, Feb 14, 2016 at 04:49:29PM -0700, Chris Murphy wrote:
> On Sun, Feb 14, 2016 at 2:55 PM, Andy Smith <a...@strugglers.net> wrote:
> > $ sudo btrfs dev remove /dev/sdh /srv/tank
> > ERROR: not a block device: /dev/sdh
> 
> 
> Since now it's a missing device, it should be
> 
> sudo btrfs device remove missing /srv/tank

$ sudo btrfs device remove missing /srv/tank
ERROR: error removing device 'missing': no missing devices found to remove

> But I'm not sure if this works when the volume is not already mounted
> degraded.

I have now done:

# mount -oremount,degraded /srv/tank 

and tried again, but it produces the same response ("mount" now does
show "degraded" as one of the mount flags, however).

I have not yet tried completely unmounting it and mounting it again.

> it really doesn't make sense to me you'd want to increase risk of
> more Btrfs problems when such known things are now fixed. Consider
> 4.1.15 if you want a stable long term yet currently supportable
> kernel.

It is inconvenient to reboot just now, so if I'm able to fix things
without doing so (e.g. by balance or replace) then I would like to.

If that won't be possible then I will of course boot into a newer
kernel at the same time.

If I end up booting into 4.1.15 then it should be possible to mount
degraded and remove missing?

Cheers,
Andy
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