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FIGURE 19-10 The VMBus implementation model If you consider what happens for nonenlightened child partitions that don t understand the VMBus, you have a far greater performance hit For nonenlightened child partition requests, such as a network operation, the request goes from user mode in the child partition, to kernel mode in the child, to kernel in the parent (which hosts the emulated device the child partition sees) Finally, this ends up going to VM Worker Process in user
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mode on parent, which then makes the actual hardware request This is a slow operation requiring context switching thousands of times The VMBus avoids this because it runs in kernel and allows near direct hardware communication via the VSC and VSD These are synthetic drivers, so machines see a virtual network device The parent partition hosts all the VM support components that are not part of the hypervisor; if the parent partition reboots or is unavailable, none of the child partitions are available either The virtualization stack also exposes a management interface, which is used not only by the built-in management tool but is publicly documented via an application programming interface (API) This allows other management solutions to manage the virtualization, such as the System Center Virtual Machine Manager (SCVMM), which is discussed later A full WMI interface is also available for the management of the virtualization components
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With all that theory out of the way, let s look at the actual implementation of Windows Server 2008 server virtualization For those who followed the progress of Windows Server 2008, the virtualization story has not been an easy one the Windows Server Virtualization (WSV) component (formally known as Viridian) was pulled from the standard release cycle of the OS, and instead promised to be available as a free download within 180 days of the Windows Server 2008 RTM as the Hyper-V role A beta of Hyper-V was included as part of the 2008 RTM media The nal version of HyperV was released on June 26, 2008 It is available from Microsoft as update KB 950050 Hyper-V runs only on 64-bit platforms, and the processor must support virtualization assist (for AMD, this is AMD-V, and for Intel, it is IntelVT) The good news is that many new processors support these features, including most desktop and laptop computers In addition, hardware data execute protection must be supported and enabled via the BIOS known as NX for AMD processors and XD for Intel Although the host OS must be 64-bit, the guest OSs can be 32-bit or 64-bit Also, each VM can be con gured with multiple-processors (up to four cores), in addition to up to 64GB of memory Multiprocessing is only supported with Windows Server 2008 (32- and 64-bit) and Windows Vista SP1 (32- and 64-bit) child partitions For Windows Server 2003, 32-bit, only two-way SMP is supported For Windows Server 2003, 64-bit two cores are supported Other platforms, such as Windows 2000 SP24 and SUSE Linux Enterprise Server 10, support only a single core, which is just down to time to test for Microsoft There are no known issues, and support for other OSs with multiple processors will be added over time
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From an availability standpoint, clustering of Hyper-V servers is supported with the new VM cluster resource, which also allows a Quick Migration capability to move VMs between physical servers, plus the ability to migrate physical hosts into a virtual environment to aid in server consolidation A VM VSS provider is also provided to allow VM snapshots to be taken Management is primarily via the MMC 30-based snap-in; however, you also have scriptable interfaces in addition to WMI With the release of the Remote Server Administration Tools (RSAT) for Windows Vista SP1, you can install the Hyper-V MMC snap-in on a Vista box, which is available to download from Microsoft To enable management from Vista, ensure that the Hyper-V and Hyper-V Management Clients rewall group exceptions are enabled, which are on by default In addition, on the Vista machine, you need to enable a DCOM exception in the rewall (port 135), which is used for Hyper-V to send information back to the Hyper-V snapin The addition of the rewall rule on a Vista client xed the Cannot connect to RPC errors Here is the command to x the problem:
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