[linux-lvm] separate vg create, or merge?

[Xen]

If I can ask.

Can you separately create two PVs, put a VG to them, and fill them with 
LVs, when these VGs would have the same name, and then at some later 
point, in that sense, you would combine them?

I guess in practice if that happens you would have the ability to just 
use vgextend.

But what if you allowed two pre-existing PVs/VGs when the VGs had the 
same name, in the same system? I believe it wouldn't work very well?

Currently I just gave them different names and plan on merging them.

Regards.