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39.1. Live - Backup Pairs HornetQ allows pairs of servers to be linked together as live - backup pairs. In this release there is a single backup server for each live server. A backup server is owned by only one live server. Backup servers are not operational until failover occurs. Before failover, only the live server is serving the HornetQ clients while the backup server remains passive. When clients fail over to the backup server, the backup server becomes active and starts to service the HornetQ clients.