Oracle Database replication

We are running SAp in our organization. Currently we do have a 2 node cluster using Sun systems with storage on Sun Storedge 6130. We do have another Sun Storedge storage in our Disaster Recovery centre but with only one server.
We are intending to implement replication on the volume level between the two storage.
My question is, what is the best way of doing this such that in case of failure in the production data centre we can quickly use the DRC configuration.

Secondly which will be the better option using the volume replication or the Oracle replication?