[linux-lvm] Adding a mirror after-the-fact

[Jason Tackaberry]

> You could either mirror the whole disk using MD *without* persistent
> superblocks

This sounds like the best and most transparent solution.  But
Documentation/md.txt says:

raid level = -1 linear mode
              0 striped mode
  	      other modes are only supported with persistant super blocks

So it sounds like this won't work?  I'll give it a try and see what
happens anyway.

Thanks,
Jason.