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Cluster OS Rolling Upgrade provides the following benefits: This guide describes the various stages of the Cluster OS Rolling Upgrade process, installation steps, feature limitations, and frequently asked questions (FAQs), and is applicable to the following Cluster OS Rolling Upgrade scenarios in Windows Server 2016: Cluster OS Rolling Upgrade is fully supported by System Center Virtual Machine Manager (SCVMM) 2016.If you are using SCVMM 2016, see Upgrading Windows Server 2012 R2 clusters to Windows Server 2016 in VMM for guidance on upgrading the clusters and automating the steps that are described in this document.Complete the following requirements before you begin the Cluster OS Rolling Upgrade process: This section describes the various transition states of the Windows Server 2012 R2 cluster that is being upgraded to Windows Server 2016 using Cluster OS Rolling Upgrade.
For large clusters with enough workload and failover capacity, multiple nodes can be upgraded simultaneously.We encourage customers to complete the upgrade within four weeks.There are many optimizations in Windows Server 2016.However, it is only zero-downtime for Hyper-V and Scale-out File Server clusters.Most other workloads incur some downtime (typically a couple of minutes) when they failover, and failover is required at least once during the Cluster OS Rolling Upgrade process. Yes, we have designed Cluster OS Rolling Upgrade to be automated using Power Shell.
We do not have any plans to port this feature back to previous versions.