Brokers are in replication mode, master as live, slave as backup. On master is created durable queue with some messages, after master broker kill, slave broker is now live and queue with messages is replicated on slave. After master broker turn on, master brokers is live without backup and slave brokers is still live.

In attachment is reproducer in ansible.
Ansible doc: http://docs.ansible.com/ansible/intro_getting_started.html

To run this reproducer
install ansible on your machine (management machine)
install maven on your machine
make two virtual rhel machines and ssh-copy-id of this machines
unzip live-backup-reproducer.zip
modify hosts file in live-bakcup-reproducer, replace <ip-aadr-

> with ip of your virtual machines
run: ansible-playbook live-backup-reproducer/jamq7-ha-redundancy.yml
to clean brokers from virtual machines fun ansible-playbook live-backup-reproducer/jamq7-clean.yml