On Wed, Feb 3, 2016 at 1:30 PM, Chris Murphy <li...@colorremedies.com> wrote: > On Wed, Feb 3, 2016 at 11:14 AM, Hendrik Friedel <hend...@friedels.name> > wrote: >> Sorry, I missed this: >>> What do you get for rpm -q grub2 >> grub2-2.02-0.34.el7.centos.x86_64 >> > > Weird. I was not able to reproduce the problem with CentOS 7.0 doing > the following in virt-manager with two qcow2s backing /dev/vda and > /dev/vdb. > > 1. Install only to /dev/vda using custom partitioning, partition > scheme is btrfs. > 2. Reboot. > 3. Install btrfs-progs-4.4-1.fc23.x86_64.rpm > 4. Install kernel-ml-4.4.1-1.el7.elrepo.x86_64.rpm > ## I did those installs separately to make sure the newer progs goes > in the initramfs that's created when the newer kernel is installed; > it's just a time savings is all. > 5. Reboot > 6. btrfs dev add /dev/vdb / > 7. Reboot > 8. yum upgrade > ## at this point both devices have chunks > 9. Reboot > 10. btrfs balance start / > ## now only vdb has chunks (due to how single balance allocator works, > and vdb is bigger than vda2) > 11. Reboot. > ## still works > > Of course with a VM it's better to just grow the backing device, and > then something like 'btrfs fi resize max /' rather than have two > devices. But on a real system, you'd have two devices (with the caveat > that this is more fragile a setup than a single device because of > course if either device dies, the whole Btrfs volume implodes). > > I can try it without any updates and see if it works....
1. Install CentOS 7.0 to vda 2. reboot 3. btrfs dev add /dev/vdb / 4. reboot ## works 5. btrfs balance start / 6. reboot ## works Same thing when starting with CentOS 7.2 media. This is a NAS product using CentOS 7.2? My only guess is they've changed something broke this. -- Chris Murphy -- 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
