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Snapshot VM with cinder vol attached, can I later restore it after I completely destroy/resintall the host Operating System and OpenStack?

I need to re-install my systems. I know I can snapshot the VMs, back them up to an external drive, then later restore them. But I'm not sure how this works when one of the VMs has an iSCSI volume attached. I'm guessing I may have to do some targetcli work to get it right since I'll be changing the IP scheme on the nodes. Also it seems I may have trouble since this volume won't already exist, according to the mySQL database. Has anyone had any success doing this?