Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: lvm2 (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1848180
Title:
LVM initrd fails to activate btrfs multidevice root
Status in lvm2 package in Ubuntu:
Confirmed
Bug description:
I have two lvm volumes (/dev/mapper/raid-btrfs and /dev/mapper/fast-
btrfs) in two different volume groups. I have created a btrfs (raid1)
filesystem on top of them and that's my root filesystem.
If i define it by UUID in the root= kernel argument, i just hit bug
#1574333. Forcing my root to "/dev/mapper/fast-btrfs" by defining
GRUB_DEVICE in /etc/default/grub works around that bug.
The problem now is that initrd is only activating the device given as
root= argument, leaving the other inactive; consequently the btrfs
mount fails to find its second device and the system fails to boot
giving up at initramfs prompt.
Manually adding a line to activate also 2nd device at the bottom of
/usr/share/initramfs-tools/scripts/local-top/lvm2 and rebuilding the
initramfs works around this issue too, but i suppose my mods will be
washed away by next package upgrade.
Here is the result:
> activate "$ROOT"
> activate "$resume"
> activate "/dev/mapper/raid-btrfs"
Proposed solution:
I understand this is an uncommon setup and correctly handling multidevice LVM
roots is complicated, please just add a configuration option to manually
define/append the list of volume groups to be activated at initrd time.
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