One option is to start the server with -Djboss.node.name=nodeX.
If you prefere a standalone*.xml change you might use the name attribute as followed:
<server name="myNode" xmlns="urn:jboss:domain:2.0">
Consider that the node name default to the hostname, if you start several server at the same host you should change the node name in any case to prevent from issues.
Thanks! It works.