Re: Unable to mount loopback devices in RAID mode

[Leszek Ciesielski <skolima@gmail.com>]

On Tue, Dec 1, 2009 at 6:56 AM, TARUISI Hiroaki
<taruishi.hiroak@jp.fujitsu.com> wrote:
> Btrfs collects block device information when mount or mkfs
> (device_list_add in volumes.c), and know devid-device relation
> by collected information. So, if we make filesystem on plain
> file, btrfs cannot know devid-device relation. As a result,
> btrfs cannot know which is 'devid=3Dn', and mount fails. Same as
> this, if collected relation is cleared by shutdown, mount fails.
>
> If we need to mount a filesystem without fail(cf, /etc/fstab line),
> we should specify 'device' options for every devices(except mount
> target device) like this.
>
> # mount -t btrfs -o device=3D/dev/loop2,device=3D/dev/loop3,
> =A0device=3D/dev/loop4 /dev/loop1 /mnt/
> =A0 (when a filesystem is constructed by /dev/loop[1-4])
>
> Regards,
> taruisi

Would this option ["mount -t btrfs -o device=3D/dev/sdb2 /dev/sda2
/mnt"] work on boot, bypasing the need for "btrfsctl -a" to mount a
multi-device filesystem?
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