Openstack suporta migração ao vivo sem armazenamento compartilhado (com reserva) :
Theoretically live migration can be done with non-shared storage, using a feature known as KVM live block migration. However, this is a little-known feature in OpenStack, with limited testing when compared to live migration, and is slated for deprecation in KVM upstream.
Este documento está incompleto, no entanto. Uma implementação da migração ao vivo foi descontinuada, mas uma nova (e melhor) implementação foi feita.
Houve alguma discussão sobre isso na lista de discussão do Openstack Abr 2013, onde Daniel Berrange diz:
What I wrote above about the existing impl is still accurate. The new block migration code is now merged into libvirt and makes use of an NBD server built-in to the QMEU process todo block migration. API wise it should actually work in the same way as the existing deprecated block migration code. So if you have new enough libvirt and new enough KVM, it probably ought to 'just work' with openstack without needing any code changes in nova. I have not actually tested this myself though.