Hi Wang
I'm not so familiar with live-backup solution. On my active active cluster deployments are working fine on both cluster nodes on 2 different linux servers.
I started from standalone-ha.xml from standalone and this works perfekt.
Check with yout live-back solution if both nodes have access to JMS stores, which should be on clustered file system like GFS2.
You can configure in standalone-ha.xml the location.... if you don't do this, I think default is local on each nodes which can't work for live-backup failover, because both nodes need to be able to access to file based jmsstores for live-backup failover.