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Switch speed for instances on shared storage


I'm looking at requirements for running instances on shared storage, potentially Ceph. I'm assuming at least a 10G switch would be required to support this?

If I was using Ceph, running on compute hosts with a replica count of 2, would it be possible to configure Ceph and Openstack in such a way, that the instance data was always served up from the local disk if was available, and only fetch from the remote disk in the event of failure.

The use-case here is to be able to evacuate/re-launch instances when a compute host completely fails and I loose the local disks.