On Wednesday 21 April 2010 03:15:32 Steve Langasek wrote:
> That doesn't sound weird to me at all, it's exactly what I expected to
> hear based on my own testing here. :)

No, it's still weird. I can only boot with a mix of UUID and /dev/mapper. For 
the moment, let's call that reliable.

> So if /dev/mapper devices get mounted correctly in the presence of
> snapshots, I think we can conclude that there's no bug in lvm2/mountall
> wrt snapshots.

No, they don't. Without snapshots (and with the mix of UUID and /dev/mapper) I 
can now boot, but I just tried this with snapshots.
- With a snapshot of vg0/home, /home can not be mounted
- With a snapshots of vg0/images, /srv/images can not be mounted

> There seems to be a bug preventing /dev/mapper/vg0-opt
> from working for you, but that's unrelated to snapshotting and seems to
> be tracked as bug #557909.

Yes. I must add that the ownership of the unmountable volumes 'root:disk' is 
when a snapshot of that volume exists. So, maybe fixing bug 557909 (or bug 
561390) might also fix this one.

> there's possibly a bug in some unidentified
> component that wrongly changes /dev/mapper entries to UUID in /etc/fstab
> on upgrade; and there's a need to document in the release notes that you
> shouldn't use UUID= for lvs in /etc/fstab.

Exactly.
 
> Have I covered everything?

Almost. I'm experiencing bug 563895. Same cause as this bug, different 
situation with mdadm. I'm only mentioning this because they might be related 
somehow. (Could be wrong. I reported that bug against grub.)

-- 
When snapshots exists, mountall will not mount the parent partition
https://bugs.launchpad.net/bugs/563902
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