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You are the virtualization administrator for an organization that manages private and public cloud-based resources. The organization uses Windows Server 2008 R2 SP1 Hyper-V. All Hyper-V host servers are configured as nodes in a four-node cluster. The organization also uses System Center 2012 R2.
Operating system updates to each host server require a system reboot.
You need to ensure that the virtual machines remain online during any reboots required by the updates.
What should you do?
A. Apply updates by using the Virtual Machine Servicing Tool (VMST).
B. Configure orchestrated updates of Hyper-V host clusters in System Center 2012 R2 Virtual Machine Manager (VMM).
C. Implement cluster-aware updating with the Cluster-Aware Updating (CAU) wizard.
D. In System Center 2012 R2 Configuration Manager, add all of the servers to a collection. Deploy updates to the collection.
Correct Answer: C
Explanation/Reference:
Explanation:
http://technet.microsoft.com/en-us/library/hh831694.aspx
CAU is an automated feature that enables you to update clustered servers with little or no loss of availability during the update process. During an Updating Run, CAU transparently performs the following tasks:
. Puts each node of the cluster into node maintenance mode
. Moves the clustered roles off the node
. Installs the updates and any dependent updates
. Performs a restart if necessary
. Brings the node out of maintenance mode
. Restores the clustered roles on the node
. Moves to update the next node
For many clustered roles (formerly called clustered applications and services) in the cluster, the automatic update process triggers a planned failover, and it can cause a transient service interruption for connected clients. However, in the case of continuously available workloads such as Hyper-V with live migration or file server with SMB Transparent Failover, CAU can coordinate cluster updates with no impact to the service availability.
Note
The CAU feature is only compatible with Windows Server 2012 R2 and Windows Server 2012 failover clusters and the clustered roles that are supported on those versions.
