Re: Subvolumes cannot be mounted after raid1 conversion

[Chris Murphy <lists@colorremedies.com>]

On Tue, May 3, 2016 at 4:24 AM, Hasse Hagen Johansen
<hasse@hagenjohansen.dk> wrote:
> Ok.  I can mount it manually just fine now using this command : sudo mount -t btrfs -o subvol=music /dev/sde /mnt/temp
>
> But somehow I cannot mount it at /music anymore(and I just found out that is what has been tricking me)
>
> I have also tried with this in fstab
>
> /dev/sde  /music          btrfs device=/dev/sdd,device=/dev/sde,subvol=music          0       2

I suggest you use volume UUID, and not /dev/ designation for anything,
it's not reliable so for all we know you're forcing systemd to
explicitly mount the wrong devices because their /dev/ letters are
different. Then you can drop device= and then you can also make
fs_passno 0 instead of 2, since it doesn't apply and just makes
systemd run fsck.btrfs which then does nothing.

If that doesn't work then you should add boot parameter
systemd.log_level=debug and then after startup put the output from
'journalctl -b -o short-monotonic > journal.log' up somewhere for
others to look at. It will be much larger than usual and will make it
easier to find out where things are getting confused.



-- 
Chris Murphy