Alright, I restored the second hard drive, here's what happens when not
degraded:
tv@btraid:~$ sudo update-grub
[sudo] password for tv:
Generating grub.cfg ...
/usr/sbin/grub-probe: error: cannot find a GRUB drive for /dev/sda6
/dev/sdb6. Check your device.map.
Found linux image: /boot/vmlinuz-3.8.0-19-generic
Found initrd image: /boot/initrd.img-3.8.0-19-generic
/usr/sbin/grub-probe: warning: Couldn't find physical volume `(null)'. Some
modules may be missing from core image..
/usr/sbin/grub-probe: warning: Couldn't find physical volume `(null)'. Some
modules may be missing from core image..
/usr/sbin/grub-probe: warning: Couldn't find physical volume `(null)'. Some
modules may be missing from core image..
/usr/sbin/grub-probe: error: cannot find a GRUB drive for /dev/sda6
/dev/sdb6. Check your device.map.
/usr/sbin/grub-probe: warning: Couldn't find physical volume `(null)'. Some
modules may be missing from core image..
/usr/sbin/grub-probe: warning: Couldn't find physical volume `(null)'. Some
modules may be missing from core image..
/usr/sbin/grub-probe: warning: Couldn't find physical volume `(null)'. Some
modules may be missing from core image..
Found memtest86+ image: /memtest86+.bin
done
tv@btraid:~$ sudo btrfs filesystem show
Label: 'btraid' uuid: a77a5af6-21c1-4469-8db5-1d166087a3b3
Total devices 2 FS bytes used 882.72MB
devid 2 size 18.13GB used 3.28GB path /dev/sdb6
devid 1 size 18.13GB used 3.29GB path /dev/sda6
Btrfs v0.20-rc1
tv@btraid:~$
** Summary changed:
- update-grub fails with multi-device btrfs root filesystem
+ update-grub fails with degraded multi-device btrfs root filesystem
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https://bugs.launchpad.net/bugs/1229438
Title:
update-grub fails with degraded multi-device btrfs root filesystem
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