Follow-up Comment #6, bug #45709 (project grub):
util/grub-probe.c:268 is:
device_names = grub_guess_root_devices (grub_path);
that function exists at grub-core/osdep/unix/getroot.c:492 which is around
where I'm thinking needs to get updated.
I'll stop here for now, rather than start trying to put together a patch.
Let me know if running anything for you helps.
Here are the commands I used to set everything up as I did:
pvcreate /dev/sda2
pvcreate /dev/sdb2
pvcreate /dev/sdc2
vgcreate disk1 /dev/sda2
vgcreate disk2 /dev/sdb2
vgcreate disk3 /dev/sdc2
lvcreate disk1 -L 100G -n terra1
lvcreate disk2 -L 100G -n terra2
lvcreate disk3 -L 100G -n terra3
mkfs.btrfs -m raid1 -d raid1 /dev/disk1/terra1 /dev/disk2/terra2
/dev/disk3/terra3
Then, with the way btrfs raid works, you just mount /dev/disk1/terra1 like
it's a standalone non-raid device, and the btrfs internals pick up the other
devices.
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