Re: can't mount RAID-1 btrfs after reboot

[Jens Axboe <jens.axboe@oracle.com>]

On Fri, Aug 14 2009, Tomasz Chmielewski wrote:
> I can't mount RAID-1 btrfs after reboot (well, sort of).
>
> Using 2.6.31-rc5 and btrfs-progs 0.19, I created a RAID-1 fileystem  
> using these command line options:
>
> # mkfs.btrfs -L btrfs-data -m raid1 -d raid1 /dev/sda4 /dev/sdb4
>
>
> After which I was able to mount the filesystem with either of the below  
> (or both):
>
> # mount /dev/sda4 /mnt/btrfs-sda4
>
> # mount /dev/sdb4 /mnt/btrfs-sdb4
>
>
> After a reboot, I'm no longer able to mount the filesystem from /dev/sda4:
>
> # mount /dev/sda4 /mnt/btrfs/
>
> Mount command complains and doesn't mount it and says I can find more  
> info in dmesg:
>
> Btrfs loaded
> device label btrfs-data devid 1 transid 67 /dev/sda4
> btrfs: failed to read the system array on sda4
> btrfs: open_ctree failed
>
>
> I'm able to mount the filesystem by using /dev/sdb4:
>
> # mount /dev/sdb4 /mnt/btrfs/
>
> After which I can unmount it, and use /dev/sda4 to mount the filesystem:
>
> # umount /dev/sdb4
> # mount /dev/sda4 /mnt/btrfs/

Try btrfsctl -a first.

-- 
Jens Axboe