The cluster-service.xml below allows you to change the default partion name.
<?xml version="1.0" encoding="UTF-8"?>
<!-- ===================================================================== -->
<!-- -->
<!-- Sample Clustering Service Configuration with different name -->
<!-- -->
<!-- ===================================================================== -->
<!-- ==================================================================== -->
<!-- Cluster Partition: defines cluster -->
<!-- ==================================================================== -->
NEWPARTIONNAME
<!-- ==================================================================== -->
<!-- HA Session State Service for SFSB -->
<!-- ==================================================================== -->
NEWPARTIONNAME
jboss:service=NEWPARTIONNAME
<!-- ==================================================================== -->
<!-- HA JNDI -->
<!-- ==================================================================== -->
NEWPARTIONNAME
41100
jboss:service=NEWPARTIONNAME