From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from nm21-vm5.bullet.mail.ird.yahoo.com ([212.82.109.245]:40128 "HELO nm21-vm5.bullet.mail.ird.yahoo.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1751071Ab3EMOW0 (ORCPT ); Mon, 13 May 2013 10:22:26 -0400 Message-ID: <5190F59F.405@influence-pc.fr> Date: Mon, 13 May 2013 16:15:59 +0200 From: Vincent MIME-Version: 1.0 To: linux-btrfs@vger.kernel.org Subject: Remove a materially failed device from a Btrfs "single-raid" using partitions Content-Type: text/plain; charset=ISO-8859-1; format=flowed Sender: linux-btrfs-owner@vger.kernel.org List-ID: 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?