A recent post on i-want-my-lvm makes me realize that perhaps I don't
understand its purpose:
Is its function to re-initialize LVM or to create it new from scratch?
I am afraid to use it for fear of losing the data that I have on lvm.
But reading the man page on pvcreate:
Force the creation without any confirmation. You
can not recreate (reinitialize) a physical volume
belonging to an existing volume group. In an emergency
you can override this behaviour with -ff."
makes me think that perhaps I don't understand it.