On Sat, Apr 30, 2011 at 09:42:39PM +0100, A. James Lewis wrote: > > After completing an installation of Ubuntu 11.04 with a separate /boot > partition and BTRFS as the main filesystem (Ubuntu creates subvolumes for > / and /home). > > sda1 being the GPT stuff > sda2 being most of the disk as BTRFS > sda3 being /boot > sda4 being swap > > sdb having an identical partition table... > > I patched everything up to date, rebooted to make sure that all was ok.. > and then ran:- > > btrfs device add /dev/sdb2 / > sync > reboot > > The system stops in initrd unable to find the root filesystem... > > It's my understanding that nothing should change here, am I missing > something, I don't see how it can even tell I've added more storage, let > alone fail to boot. In order to mount a multi-volume btrfs filesystem, the kernel needs to know all of the devices that make up the filesystem. It can't do that itself, so it needs some userspace assistance. Your system needs to run "btrfs dev scan" from the initrd before attempting to mount the root filesystem. On Debian, installing btrfs-tools will (I believe) set that up. To get the system booting again temporarily, you could try adding the option "mount=device=/dev/sda2,device=/dev/sdb2" (I think) to the kernel command-line parameter in your boot loader. That should give enough information to the initrd to be able to find the volumes that your btrfs lives on, and get you enough of a system that you can work out what's wrong with your initrd. Hugo. -- === Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk === PGP key: 515C238D from wwwkeys.eu.pgp.net or http://www.carfax.org.uk --- If it ain't broke, hit it again. ---
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