I don't understand the question.
If you use a fresh unzipped JBoss (BTW which version do you use) you need to start two instances (run.sh -c all) in the same network and should see in the server.log a message that the cluster has "No of members #".
Only if that work you have a cluster.
And what you mean by "... to make our deployment cluster safe?"
We have a cluster, it works sporadically, but it generates a lot of errors. We are trying to figure out the source of those errors, and I noticed that some of the parameters in the profile we are using (which is "all") do *not* appear to be set for clustering, and wondered if that could be part of the problem. For example, the jboss-service.xml file that I cited above includes a parameter with the note, "Uncomment to make it cluster-safe." What does that mean? I'm not sure, but if we are using a cluster, it seems like it ought to be uncommented.
We are using SOA-P 5.3.0.