LMV2 boot from another Volume Group?

[Tony Nelson]

I have two hard drives I want to boot from, each with its own LVM2 
Volume Group.  I can boot from the one on the same drive as Grub, but 
not from the other one.  Apparantly, only Logical Volumes from the boot 
drive's Volume Group are detected before / is mounted (something about 
"activation", perhaps?).  Googling only shows how to detect Volume 
Groups and activate Logical Volumes after / is mounted.  I can't find 
any kernel LVM parameters that would affect this (and I'd need the LVM 
stuff built-in to the kernel, not as a module).

Can Linux use a Volume Group that isn't on Grub's boot volume?

Must I add a boot partition on the second disk and chainload to it?

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