Remove a materially failed device from a Btrfs "single-raid" using partitions

[Vincent <vincent@influence-pc.fr>]

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?