Host-clustering support in Virtual Server can be used to help reduce planned downtime due to hardware and software upgrades, as well as unplanned downtime due to events such as hardware failure. Virtual Server 2005 R2 supports up to eight physical hosts in a cluster.
In a solution based on Windows Vista Enterprise Centralized Desktop, host clustering can be used to move VM images to another physical host in the cluster before applying scheduled software updates. Alternately, administrators can apply software updates and restart the server, at which time the VMs running on that server will failover automatically to another host in the cluster.
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