See the following step-by-step guide (complete w/ screenshots ) [1] that
I threw together on how to use Aeolus and Snap [2] to migrate a running
instance between two separate cloud providers with no downtime
(demonstrated is EC2 / rackspace but this will work to/from RHEV-M or
any other cloud provider supported by aeolus/deltacloud [3])
-Mo
[1]
http://mo.morsi.org/blog/node/347
[2]
https://github.com/movitto/snap
[3]
http://incubator.apache.org/deltacloud/drivers.html#h2