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

[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.

--Sean