You get built-in high availability with the ES7000 that commodity servers can't deliver, with its hardware isolation of a failed component that's most often transparent to the user, causing little if any downtime. Research shows that hardware causes only about 20 percent of downtime, so it's the total environment you have consider. The other 80 percent of high availability issues needs to be addressed. Industry analysts like Gartner note that the major influences on application availability are the quality of the application itself and the operational practices used to manage it. That's why Unisys high availability services and support take a holistic approach, looking at every aspect that can affect availability.
Some applications demand a clustered environment.
And to address the clustered environment Unisys has developed Cluster Application Defender to improve both functionality and management of clustered systems. Taking all of this into account, when you're using Unisys High Availability Configurations for the ES7000 with Windows 2000 Datacenter, Unisys offers you system uptime guarantees .