The easiest way is to define different multicast address and additionally if you want set different partition name to every jboss instance.
i konw this is an old thread, but i disabled clustering on my jboss eap 5 "production" profile by doing:
remove the following section from the BootstrapProfileFactory bean defined in conf/bootstrap/profile.xml
remove the following section from the VFSCache bean defined in conf/bootstrap/vfs.xml
ive only tested that http works after as this is the only service i need.