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Date: Thu, 13 Aug 2015 15:34:37 +0800
From: anand jain <anand.jain@oracle.com>
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To: Ulli Horlacher <framstag@rus.uni-stuttgart.de>,
        linux-btrfs@vger.kernel.org
Subject: Re: RAID0 wrong (raw) device?
References: <20150812130758.GA26529@rus.uni-stuttgart.de>
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> root@toy02:~# df -T /data
> Filesystem     Type   1K-blocks      Used  Available Use% Mounted on
> /dev/sdb       btrfs 3906909856 140031696 3765056176   4% /data
>
> root@toy02:~# btrfs filesystem show /data
> Label: data  uuid: 411af13f-6cae-4f03-99dc-5941acb3135b
>          Total devices 2 FS bytes used 129.81GiB
>          devid    3 size 1.82TiB used 67.03GiB path /dev/drbd2
>          devid    4 size 1.82TiB used 67.03GiB path /dev/sdb
>
> Btrfs v3.12
>
> ==> btrfs shows the wrong (raw) device /dev/sdb instead of /dev/drbd3 !

Don't be too alarmed by that, progs do a bit of user land fabrication 
(wrong). kernel may /may-not be using sdb. try -m option.

just in case if it didn't, Then use mount -o devices / btrfs dev scan 
<dev> option to provide the desired dev path to the kernel.

Thanks, Anand