On Mon, May 13, 2013 at 4:15 PM, Vincent <vincent@xxxxxxxxxxxxxxx> wrote:
> Hello,
>
> I am on Ubuntu Server 13.04 with Linux 3.8.
>
> I've created a "single-raid" using /dev/sd{a,b,c,d}{1,3}. One of my hard
> drives has failed, I mean it's materially dead.
>
> :~$ sudo btrfs filesystem show
> Label: none uuid: 40886f51-8c9b-4be1-8721-83bf5653d2a0
> Total devices 5 FS bytes used 226.90GB
> devid 4 size 37.27GB used 31.01GB path /dev/sdd1
> devid 3 size 37.27GB used 31.01GB path /dev/sdc1
> devid 2 size 37.31GB used 31.00GB path /dev/sdb1
> devid 1 size 139.73GB used 132.02GB path /dev/sda3
> *** Some devices missing
>
>
> Many tutorials I found about it never mention the simple deletion of a
> non-remountable disk in case of a "single-raid" (where the datas doesn't
> matter, I've used the only "d=single" option, insinuating "m=mirrored").
>
> I've read this page http://www.howtoforge.com/a-beginners-guide-to-btrfs
> until "8 Adding/Deleting Hard Drives To/From A btrfs File System" section.
> But this page want to make me mount the drive, but it's dead.
>
> When my Btrfs partition is not mounted and when I do:
> :~$ sudo btrfs device delete missing
> btrfs device delete: too few arguments
> or
> :~$ sudo btrfs device delete missing /media/single-raid/
> Nothing happen.
>
> If I try to mount the failed device, and remove /dev/sde1 from the
> mountpoint, my console doesn't respond anymore.
>
> I've also read the official documentation
> https://btrfs.wiki.kernel.org/index.php/Using_Btrfs_with_Multiple_Devices#Removing_devices
> using degraded mode: mount -o degraded /dev/sda3 /media/single-raid/
>
> The fstab line is however: /dev/sda3 /media/single-raid/
> btrfs device=/dev/sda3,device=/dev/sdb1,device=/dev/sdc1,device=/dev/sdd1 0
> 2
>
> Then perform :~$ sudo btrfs filesystem show
> Label: none uuid: 40886f51-8c9b-4be1-8721-83bf5653d2a0
> Total devices 5 FS bytes used 226.30GB
> devid 4 size 37.27GB used 31.01GB path /dev/sdd1
> devid 3 size 37.27GB used 31.01GB path /dev/sdc1
> devid 2 size 37.31GB used 31.00GB path /dev/sdb1
> devid 1 size 139.73GB used 132.02GB path /dev/sda3
> **** Some devices missing*
>
> I don't understand why in degraded mode I can't remove the failed device.
> Could you help me please?
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If you have used d=single, it means that the data that was on the
drive that failed is now gone. I think btrfs refuses to remove devices
if it means data loss, but I could be wrong here..
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