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[http://www.thomas-krenn.com Thomas-Krenn.AG] is a server specialist, selling server systems and solutions. One of the solution products is a pre-installed [http://www.thomas-krenn.com/en/system-solutions/ha-linux-cluster.html cluster system], built with Virtuozzo. They published how to build such a cluster with OpenVZ at [[HA_cluster_with_DRBD_and_HeartbeatHA cluster with DRBD and Heartbeat]].