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Introducing

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Figure 2-6: Offline migration<br />

In Windows Server 2008 Hyper-V, you could move a VM from one host to another host only when the<br />

VM was offline.<br />

Later, with the release of Windows Server 2008 R2, live migration made it possible for the first time to<br />

move a VM while it was still running. However, live migration was available only between clustered<br />

Hyper-V hosts where the VMs lived on a cluster shared volume (CSV), as shown in Figure 2-7.<br />

Figure 2-7: Live migration<br />

Windows Server 2008 R2 Hyper-V introduced the ability to move running VMs from one cluster node<br />

to another cluster node.<br />

A completely new level of freedom came with Windows Server 2012 and its ability to live-migrate VMs<br />

between any Hyper-V hosts of the same version (see Figure 2-8), regardless of whether either the<br />

source or destination was part of a failover cluster.<br />

Figure 2-8: Any host, same OS live migration<br />

Windows Server 2012 Hyper-V introduced the ability to move running VMs from any host to any<br />

other host.<br />

18 CHAPTER 2 | Software-defined datacenter

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