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Features of Windows Server Virtualization

Now that we understand something about how virtualization works (or will work) on Windows Server 2008, let’s look at what it can actually do. Here’s a quick summary:

§ Creates and manage child partitions for both 32-bit (x86) and 64-bit (x64) operating systems.

§ Creates VMs that can use SMP to access 2, 4, or even 8 cores.

§ Creates VMs that use up to 1 TB of physical memory. Windows Server virtualization can do this because it’s built on 64-bit from the ground up. That means 64-bit HV, 64-bit virtualization stack, and so on.

§ Supports direct pass-through disk access for VMs to provide enhanced read/write performance. Storage is often a bottleneck for physical machines, and with virtual disks it can be even more of a bottleneck. Windows Server virtualization overcomes this issue.

§ Supports hot-add access to any form of storage. This means you can create virtual storage workloads and manage them dynamically.

§ Supports dynamic addition of virtual NICs and can take advantage of underlying virtual LAN (VLAN) security.

§ Includes tools for migrating Virtual Server workloads to Windows Server virtualization. This means your current investment in Virtual Server won’t go down the drain.

§ Supports Windows Server 2008 Core as the parent OS for increased security. I said this earlier, but it bears repeating here because it’s important.

§ Supports NAT and network quarantine for VMs, role-based security, Group Policy, utilization counters, non-Microsoft guests, virtual machine snapshots using Volume Shadow Copy Service (VSS), resource control using Windows System Resource Manager (WSRM), clustering, and a whole bunch of other things.

To put this all in perspective, take a look at Table 3-1, which provides a comparison between Virtual Server 2005 R2 and Windows Server virtualization.