This guide details the steps required to perform a live migration of Hyper-V™ virtual machines from one node in a Windows Server® 2008 R2 failover cluster to another node.
Live migration is a new Hyper-V feature in Windows Server 2008 R2, which requires the failover clustering role to be added and configured on the servers running Hyper-V. Live migration allows you to transparently move running virtual machines from one node of the failover cluster to another node in the same cluster without a dropped network connection or perceived downtime. In addition, failover clustering requires shared storage for the cluster nodes. This can include an iSCSI or Fiber-Channel Storage Area Network (SAN). All virtual machines are stored in the shared storage area, and the running virtual machine state is managed by one of the nodes. For a detailed overview of live migration and the benefits of using it, see Windows Server 2008 R2 Hyper-V Live Migration.
This guide assumes you are familiar with the requirements for using Hyper-V and failover clustering, which are covered in Hyper-V Step-by-Step Guide: Hyper-V and Failover Clustering.
Specific recommendations to consider before using live migration are listed below:
Hyper-V provides processor compatibility settings to make it easier to perform a live migration of a virtual machine to another physical computer with a different processor version. The Migrate to a physical computer with a different processor version setting in Hyper-V Manager allows you to move a running virtual machine to a physical computer with different processor features without restarting the virtual machine. It is recommended that you enable this setting to ensure that the virtual machine uses only the features of the processor that are available on all versions of a virtualization-capable processor by the same processor manufacturer. It does not provide compatibility between different processor manufacturers. When this setting is not used, Hyper-V provides the virtual machine with all the virtualization features offered by the physical processor. The setting is also useful for high availability and backup and recovery scenarios because it makes it easier to move a highly available virtual machine to another node in a cluster or restore the virtual machine to different hardware.
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