From: Jeremy Katz <katzj(a)redhat.com>
... the LVM1 volumes should be found in anaconda and you should just
be able to assign them mount points. As far as conversion, anaconda
isn't going to do this, but '/sbin/lvm vgconvert' should be able to do
you da man. this is the nugget of information i've been looking for.
so my plan is to back everything up, and do a fresh install over top
of the non-user-data logical volumes, then carefully restore all of my
system settings as if i was doing it from a brand new install. and at
some point, vgconverting everything to LVM2.
at that point, it will definitely be molson time.