You will need a feature called intersite state transfer which I am contributing for the 5.3 release. The details of the design are HERE. The main idea is to keep consistency while state is migrating to a site.
I was hoping that you'd be able to clarify something in regards to the release version for the state transfer. Based on the Infinispan roadmap (https://docs.google.com/document/d/1OrluOXyNorAaKes5qpFxjc0Qa9duMlpt5LuIV0IXCc0/pub) it states that this is not due until version 6, however the ISPN states that it will be released in version 5.3.0.Final (https://issues.jboss.org/browse/ISPN-604). Which one of these is correct?