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these editions include multiple free licenses for virtualized versions of WS08 This will also simplify provisioning
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FIGURE 6-1 Resource pools using blade host servers with shared storage
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Build the Windows Server 2008 Network Infrastructure
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Component Processors RAM Storage connectivity C: Volume D: Volume E: Volume VM Volume structure Networking Configuration
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Description Minimum: Two dual-core processors Recommended: Two quad-core processors or four dual-core processors Minimum: 8 GB Recommended: 16 GB Host bus adapter (HBA) for fiber optics or iSCSI 40 GB plus space for paging file (minimum two times RAM) Allow an average of 50 to 100 GB for each virtual machine Example: 16 x 100 GB = 16 TB 20 GB for volume shadow copies Expandable disks to make the best use of disk space Minimum: 2 x 1 Gbit Ethernet Recommended: 4 x 1 Gbit Ethernet
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TABLE 6-1 A Typical Host Server Blade Configuration
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Because of the nature of the Hyper-V role, each host server will need to run a management partition (see Figure 6-2) As you can see, Hyper-V is based on a thin hypervisor layer that runs directly on top of hardware certified for Windows Server Then the parent partition provides the interface to virtual machine management, while virtual machines use the virtual machine client extensions to interact with the virtual machine bus that is exposed
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Parent Partition
VM Worker Process VM Worker Process VM Worker Process
Native Partition
Legacy Partition
Linux Partition
Operating System Hyper-V ISV/IHV/OEM
Applications
WMI Provider VM Service
Applications
Applications
Microsoft/Citrix XenServer
User Mode
Windows Server 2008 x64 Server Core Windows Server 2003 or Windows Server 2008
Windows Kernel Virtual Machine Client Extensions
Non-hypervisor-aware Operating System (Windows NT, Windows 2000, or Windows XP)
Xen-Enabled Linux Kernel
Linux Virtual Machine Client Extensions Hypercall Adapter
Windows Kernel Virtual Machine Parent
Virtual Machine Bus (VMBus)
Virtual Machine Bus (VMBus)
Emulation
Virtual Machine Bus (VMBus)
Kernel Mode
Windows Hypervisor (Hyper-V)
Designed for Windows Server Hardware
FIGURE 6-2
Hyper-V resource structure
Part III:
Design Server Roles
through the hypervisor These client extensions are built directly into WS08 This means that any virtualized instance of WS08 will be able to properly contend for physical resources and will be a well-behaved virtual client And, because of Microsoft s partnership with Citrix, Xen-enabled Linux distributions can also take advantage of the VMBus through special client extensions of their own In addition to the parent partition, you will have to load the Domain Controller (DC) role on at least two host servers These should be properly identified and configured appropriately, since they will be playing an additional role along with Hyper-V Two domain controllers should be sufficient for this forest, since only utilities such as host servers will be connecting to this domain In addition, you want to keep this number small because it adds overhead to the server, limiting the number of virtual machines it can host
C AUTION Do not make these domain controllers virtual machines If you need to start the host
machines and the domain controllers are stopped, you will have difficulty entering into the domain The problem becomes compounded when the stopped domain controllers are on hosts that are also stopped Run this role on actual, physical machines and make sure one of them is up at all times These servers should be clustered as much as possible to provide high availability for the virtual service offerings they will support They should also be running the Distributed File System (DFS) replication services to help protect the virtual machines they host These highavailability configurations are covered in 11, since it discusses business continuity strategies For immediate protection, you should configure the Volume Shadow Copy service to ensure that you have a local backup of each VM For management purposes, you will need an appropriate number of consoles to administer each of the resource pool s nodes Ideally, this will be performed from operator PCs running the Hyper-V administration role or running Microsoft System Center Virtual Machine Manager (SCVMM)
NOTE SCVMM is an excellent addition to any dynamic datacenter running a virtual
infrastructure Information on SCVMM can be found at wwwmicrosoftcom/systemcenter/ scvmm/defaultmspx Therefore, you need to do the following when you prepare the resource pool: 1 Provision an initial host server 2 Configure IP and other settings to personalize the server 3 Install/configure security systems on the host 4 Add the Domain Controller role and create the utility forest 5 Provision a second host server 6 Configure IP and other settings to personalize the server 7 Install/configure security systems on the host 8 Add the Domain Controller role and join the utility forest 9 Configure high availability for the two hosts Configure the Volume Shadow Copy Service (VSS) 10 Install consoles to begin managing the resource pool
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