[arch-general] LVM + mdadm no longer works on boot

[Thomas Bächler]

Am 22.10.2013 05:46, schrieb Sean Greenslade:
> On Mon, Oct 21, 2013 at 02:55:20PM +0200, Thomas Bächler wrote:
>> Am 21.10.2013 03:34, schrieb Sean Greenslade:
>>> And now, after another system update, the problem has vanished.
>>> There was a kernel update, so I'm willing to believe that it was
>>> just some strange transient interaction between LVM, mdadm and the
>>> initramfs kernel. Just another day in the life of Arch, I suppose.
>>
>> This is confusing.
>>
>> A common problem is that the mkinitcpio image is generated
>> mid-upgrade. If some component of lvm is updated before the kernel and
>> another is upgraded after, this may lead to broken images. We can't
>> prevent this from happening right now, but OTOH I haven't seen it in a
>> while.
>>
>> To be on the safe side, run 'mkinitcpio -P' after kernel updates.
> 
> That would make sense. I didn't try enough downgrade-upgrade cycles to
> test that theory. I'll add that to the list of things to do when
> updating.

For the future, pacman hooks ([1]) may solve that problem without user
interaction, but as far as I know nothing has been implemented yet.

[1] https://wiki.archlinux.org/index.php?title=User:Allan/Pacman_Hooks


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