I think you need two Fuse Message broker instances .. one on Server A (B1) and one on Server B (B2), connected to each other via a NetworkConnector. Once the network connector is established, and a subscriber attaches to B2, the producer on B1 will send messages over the network connector to the other broker.
B1 can be clustered for HA/failover using your SAN and the AmqPersistenceAdapter if required.
On B2 you probably need a durable subscriber and the producer on B1 should send persistent messages to get the desired QOS.
Hope this helps,