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Not sure what you exactly want , see
https://kimizhang.wordpress.com/2015/02/12/nfs-backend-for-openstack-glancecinderinstance-store/
http://www.sebastien-han.fr/blog/2015/03/16/openstack-glance-nfs-and-compute-local-direct-fetch/

UPDATE
Per your second concern I would recommend follow:-
https://kimizhang.wordpress.com/2013/08/26/openstack-vm-live-migration/#LiveMigration-Sharedstoragebasedlivemigration

Setup GlusterFS cluster for nova-compute nodes as the most simple solution (not best)

I know that Ceph appears to be a kind of standard for Glance and Cinder back ends in meantime
But setting up Ceph Cluster and tune it to work with nova might be more complicated then Gluster's one at list via my experience
http://docs.openstack.org/ha-guide/storage-ha-backend.html

 The final conclusion (from myself of course) is :- As far live migration comes into concern you get forced to set up    Ceph or Gluster Clusters to serve as Glance back end.

END

Not sure what you exactly want , see
https://kimizhang.wordpress.com/2015/02/12/nfs-backend-for-openstack-glancecinderinstance-store/
http://www.sebastien-han.fr/blog/2015/03/16/openstack-glance-nfs-and-compute-local-direct-fetch/

UPDATE
Per your second concern I would recommend follow:-
https://kimizhang.wordpress.com/2013/08/26/openstack-vm-live-migration/#LiveMigration-Sharedstoragebasedlivemigration

Setup GlusterFS cluster for nova-compute nodes as the most simple solution (not best)

I know that Ceph appears to be a kind of standard for Glance and Cinder back ends in meantime
But setting up Ceph Cluster and tune it to work with nova might be more complicated then Gluster's one at list via my experience
http://docs.openstack.org/ha-guide/storage-ha-backend.html

 The final conclusion (from myself of course) is :- As far live migration comes into concern you get forced to set up    Ceph or Gluster Clusters to serve as Glance back end.

See also
http://ceph.com/planet/live-demo-openstack-and-ceph/
END

Not sure what you exactly want , see
https://kimizhang.wordpress.com/2015/02/12/nfs-backend-for-openstack-glancecinderinstance-store/
http://www.sebastien-han.fr/blog/2015/03/16/openstack-glance-nfs-and-compute-local-direct-fetch/

UPDATE
Per your second concern I would recommend follow:-
https://kimizhang.wordpress.com/2013/08/26/openstack-vm-live-migration/#LiveMigration-Sharedstoragebasedlivemigration

Setup GlusterFS cluster for nova-compute nodes as the most simple solution (not best)

I know that Ceph appears to be a kind of standard for Glance and Cinder back ends in meantime
But setting up Ceph Cluster and tune it to work with nova might be more complicated then Gluster's one at list via my experience
http://docs.openstack.org/ha-guide/storage-ha-backend.html

 The final conclusion (from myself of course) is :- As far live migration comes into concern you get forced to set up    Ceph or Gluster Clusters to serve as Glance back end.

See also
http://ceph.com/planet/live-demo-openstack-and-ceph/
http://docs.ceph.com/docs/master/rbd/rbd-openstack/
END

Not sure what you exactly want , see
https://kimizhang.wordpress.com/2015/02/12/nfs-backend-for-openstack-glancecinderinstance-store/
http://www.sebastien-han.fr/blog/2015/03/16/openstack-glance-nfs-and-compute-local-direct-fetch/

UPDATE
Per your second concern I would recommend follow:-
https://kimizhang.wordpress.com/2013/08/26/openstack-vm-live-migration/#LiveMigration-Sharedstoragebasedlivemigration

Setup GlusterFS cluster for nova-compute nodes as the most simple solution (not best)

I know that Ceph appears to be a kind of standard for Glance and Cinder back ends in meantime
But setting up Ceph Cluster and tune it to work with nova might be more complicated then Gluster's one at list via my experience
http://docs.openstack.org/ha-guide/storage-ha-backend.html

 The final conclusion (from myself of course) is :- As far live migration comes into concern you get forced to set up    Ceph or Gluster Clusters to serve as Glance back end.

See also
http://ceph.com/planet/live-demo-openstack-and-ceph/
http://docs.ceph.com/docs/master/rbd/rbd-openstack/
ENDEND UPDATE

Not sure what you exactly want , see
https://kimizhang.wordpress.com/2015/02/12/nfs-backend-for-openstack-glancecinderinstance-store/
http://www.sebastien-han.fr/blog/2015/03/16/openstack-glance-nfs-and-compute-local-direct-fetch/