Comment 10 for bug 1398999

I think there is a valid case for doing block migrate with a cinder volume attached to an instance:

* Cloud isn't using a shared filesystem for ephemeral storage
* Instance is booted from an image, and a volume is attached afterwards. An admin wants to take the box the instance is running on offline for maintenance with a minimal impact to the instances running on it.

The 'fix' was a a workaround not not an actual fix. It sounds like a fix is needed in libvirt first.

http://lists.openstack.org/pipermail/openstack-dev/2015-March/059324.html