26.09.2017 10:31, Lukas Pirl пишет:
> On 09/25/2017 06:11 PM, linux-btrfs@oh3mqu.pp.hyper.fi wrote as excerpted:
>> After a long googling (about more complex situations) I suddenly
>> noticed "device sdb" WTF???  Filesystem is mounted from /dev/md3 (sdb
>> is part of that mdraid) so btrfs should not even know anything about
>> that /dev/sdb.
> 
> I would be interested in explanations regarding this too. It happened
> to me as well, that I was confused by /dev/sd* device paths being
> printed by btrfs in the logs, even though it runs on /dev/md-*
> (/dev/mapper/*) devices exclusively.
> 

Could be related:

https://forums.opensuse.org/showthread.php/526696-Upgrade-destroys-dmraid?p=2838207#post2838207