Re: Howto mount intact left-over device of a degraded btrfs-raid?
On Tue, Jan 26, 2010 at 01:20:30PM +0100, Mr. Tux wrote: On Monday 25 January 2010 23:08:39 Josef Bacik wrote: Hi Josef Hmm well I'm trying to reproduce that here and it's working fine, course I can't pull a cable on my disk since I only have one disk to test with. Would you mind sending me your dmesg after you try mount -o degraded /dev/sda1 /mnt/ so I can see whats going on. Thanks, Did you try 2.6.32.2 from kernel.org? Is it possible to use a second test drive like I did? I know you can create a raid array with one device missing, but the segfault happened with a two member raid1. I don't have the test environment any more, so I can't offer a backtrace right now - but I will set it up again in the next few days. If it happens again I will contact you and send you a backtrace. Ok I think I've tracked down all the various problems that you were having with this. I've sent 3 patches to the list just now Btrfs: check total number of devices when removing missing Btrfs: check return value of open_bdev_exclusive properly Btrfs: do not mark the chunk as readonly if in degraded mode Make sure you run btrfsctl -a before running mount -o degraded. I made that mistake and things still didnt work. Let me know if you have any problems. Thanks, Josef -- To unsubscribe from this list: send the line unsubscribe linux-btrfs in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: Howto mount intact left-over device of a degraded btrfs-raid?
On Wed, Jan 20, 2010 at 07:31:24PM +0100, Mr. Tux wrote: Hi list I tried to mount the intact device of a two memer btrfs raid array with one device missing: # mount -o degraded /dev/sdb /mnt this wouldn't work with kernel 2.6.32-2 - caused some sort of memory segfault # btrfs-vol -r missing /mnt complained and refused to mount the array degraded with only one intact array member left - demanded two intact members How can I mount this array anyway? How did you setup this array to begin with? I'm trying to reproduce this bug but I haven't been able to. Thanks, Josef -- To unsubscribe from this list: send the line unsubscribe linux-btrfs in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: Howto mount intact left-over device of a degraded btrfs-raid?
On Monday 25 January 2010 19.43:27 Josef Bacik wrote: How did you setup this array to begin with? I'm trying to reproduce this bug but I haven't been able to. Thanks, Hi Josef, Thanks for your help! Linux Kernel 2.6.32.2 from kernel.org (was marked as stable at that time, I compiled it using make-kpkg with btrfs support inside the kernel - not modular) OS: Debian Lenny 5.03 I created the btrfs raid on a two sata-II drives like this: mkfs.btrfs -d raid1 -m raid 1 /dev/sda4 /dev/sdb4 Then I mounted the btrfs with: mount /dev/sda4 /mnt/ cat /proc/mounts and dmesg showed the raid was mounted successfully Then I started to copy large amount of data into the raid1 from a file server. With the copying process ongoing I detached the data cable from one device to simulate hardware failure. Copying process went on as planed to the drive still attached. Then I unmounted the btrfs raid like this: umount /mnt/ and I shut down the system. Now the goal was to boot and mount only the intact btrfs partition again as a degraded raid. I followed the multiple-device-wiki of btrfs [1] I didn't try to remove the faulty device - I shut down the system already and booted again without the faulty drive. So I tried this: mount -o degraded /dev/sda /mnt/ This caused a memory segfault - the system still ran, but I couldn't use the array any more. So I used the next command btrfs-vol -r missing /mnt Complained it couldn't mount with only one member present. My assumption: Bad luck with the kernel - or did this memory segfault happen on earlier kernel versions as well? [1] http://btrfs.wiki.kernel.org/index.php/Using_Btrfs_with_Multiple_Devices#Replacing_Failed_Devices -- To unsubscribe from this list: send the line unsubscribe linux-btrfs in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: Howto mount intact left-over device of a degraded btrfs-raid?
On Mon, Jan 25, 2010 at 10:46:47PM +0100, Mr. Tux wrote: On Monday 25 January 2010 19.43:27 Josef Bacik wrote: How did you setup this array to begin with? I'm trying to reproduce this bug but I haven't been able to. Thanks, Hi Josef, Thanks for your help! Linux Kernel 2.6.32.2 from kernel.org (was marked as stable at that time, I compiled it using make-kpkg with btrfs support inside the kernel - not modular) OS: Debian Lenny 5.03 I created the btrfs raid on a two sata-II drives like this: mkfs.btrfs -d raid1 -m raid 1 /dev/sda4 /dev/sdb4 Then I mounted the btrfs with: mount /dev/sda4 /mnt/ cat /proc/mounts and dmesg showed the raid was mounted successfully Then I started to copy large amount of data into the raid1 from a file server. With the copying process ongoing I detached the data cable from one device to simulate hardware failure. Copying process went on as planed to the drive still attached. Then I unmounted the btrfs raid like this: umount /mnt/ and I shut down the system. Now the goal was to boot and mount only the intact btrfs partition again as a degraded raid. I followed the multiple-device-wiki of btrfs [1] I didn't try to remove the faulty device - I shut down the system already and booted again without the faulty drive. So I tried this: mount -o degraded /dev/sda /mnt/ This caused a memory segfault - the system still ran, but I couldn't use the array any more. So I used the next command btrfs-vol -r missing /mnt Complained it couldn't mount with only one member present. My assumption: Bad luck with the kernel - or did this memory segfault happen on earlier kernel versions as well? [1] http://btrfs.wiki.kernel.org/index.php/Using_Btrfs_with_Multiple_Devices#Replacing_Failed_Devices Hmm well I'm trying to reproduce that here and it's working fine, course I can't pull a cable on my disk since I only have one disk to test with. Would you mind sending me your dmesg after you try mount -o degraded /dev/sda1 /mnt/ so I can see whats going on. Thanks, Josef -- To unsubscribe from this list: send the line unsubscribe linux-btrfs in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Howto mount intact left-over device of a degraded btrfs-raid?
Hi list I tried to mount the intact device of a two memer btrfs raid array with one device missing: # mount -o degraded /dev/sdb /mnt this wouldn't work with kernel 2.6.32-2 - caused some sort of memory segfault # btrfs-vol -r missing /mnt complained and refused to mount the array degraded with only one intact array member left - demanded two intact members How can I mount this array anyway? thanks! -- To unsubscribe from this list: send the line unsubscribe linux-btrfs in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
