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Best Practices for Virtualizing and Managing Exchange 2013

Figure 25: Cluster-Aware Updating Wizard

CAU can perform the cluster updating process in two different modes: self-updating mode and remote-

updating mode. In self-updating mode, the CAU clustered role is configured as a workload on the failover

cluster that is to be updated. In remote-updating mode, a remote computer running Windows Server

2012 or Windows 8 is configured with the CAU clustered role. This remote computer is also called the

Update Coordinator and is not part of the cluster that is updating.

Note that for many clustered roles in a cluster, the automatic updating process triggers a planned failover,

which, in turn, can cause a service interruption for a very short time (transient).

Best Practices and Recommendations

Use the CAU feature with continuously available cluster workloads in Windows Server 2012 to

perform updates on clusters with no impact on service availability. Examples of continuously

available cluster workloads in Windows Server 2012 are file servers (file server with SMB

Transparent Failover) and Hyper-V virtual machines with live migration. With CAU, virtualized

Exchange Servers experience no downtime, even though underlying hosts are being patched and

potentially taken offline for maintenance.

Create Updating Run Profiles for different classes of failover clusters, and store and manage them

on a centralized file share. This ensures that the CAU deployments consistently apply updates to

the clusters throughout the IT organization (even across different departments, line-of-business

areas, or administrators).

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