In previous code we didn't check whether we have an enabled
backup service there before we send out the rpc request,
results that if no enabled backup service there,the volume will
stays in "backing-up" state and the backup will stays in "creating".
This patch fixed this issue, we exam whether at least an appropriate
(same host,az as the volume and is_alive) backup service available
before we do the rpc request.
Code Review / openstack-build / cinder-build.git / commit