##cinder/nova
- live migration cannot work. update: apparently it does work in grizzly
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real live migration will fail as a preflight check that nova does is to test if you are using shared storage for your /var/lib/nova/instances directory (it writes a test file to the shared location on one host, then checks to see if it can see it on the other). Given that RBD is not 'shared storage' in this sense, the check fails. NOT fixed in Havana, though it's noted that ceph and libvirt will play nicely outside of nova
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block migration will fail as there is no actual disk for the process to copy from one host to another
- each compute host needs to be 'manually' configured with the libvirt secret/key when using cephx