Cluster-Aware Updating
With clustering as a major component of many of the continuous availability technologies, the ability to patch and update the cluster nodes without interruption to network services becomes important for continuous availability. New in Windows Server 2012 is Cluster-Aware Updating (CAU), which enables, as part of the patching and updating process, a method for cluster nodes to have network services failed over, get patched and updated, and failed back to an operational state. The CAU process simplifies updates and minimizes system operations downtime during critical patches and update cycles. You can find more on CAU in Chapter 29.
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