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Paul Thurrott reports:
With Hyper-V Server 2008, Microsoft's Hyper-V hypervisor is installed in the parent partition, and it provides just the bare essentials required for booting the system, providing hypervisor services, and exposing the management hooks necessary for System Center Virtual Machine Manager 2008. It does include drivers as well, but little else from Server 2008. It's not Server Core. It's much less than that: At boot time, you'll be prompted from a command line interface to configure some basic configuration options. But management occurs from the free Hyper-V management console (on Vista or Server 2008) or System Center Virtual Machine Manager 2008.
Microsoft says the performance characteristics of Server 2008 Hyper-V and Hyper-V Server 2008 are identical. But this version of the product has a few differences. It's limited to four physical processors and 32GB of RAM. There is no clustering support.
Because Hyper-V Server 2008 does not include Server 2008, customers who choose to install this version of the hypervisor will typically run Windows Server 2000 or Windows Server 2003, or SuSE Linux, in child partitions on the server. (You can run Server 2008 in a child partition, but if you're going to do that, it makes more sense to use that as the parent partition and stick with Server 2008 Hyper-V.) So it's a good solution only for those times when Server 2008 is not needed. And if you still need to run Windows NT 4.0 virtual machines, you'll have to stick with Virtual Server 2005 R2. Fortunately, all of these environments can be managed via a single tool, System Center Virtual Machine Manager 2008.
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