c# barcode reader sample Build the Windows Server 2008 Network Infrastructure in Software

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Build the Windows Server 2008 Network Infrastructure
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The Parallel Network Migration Approach
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that includes sufficient resources to run virtual machines, yet is only based on x86 hardware, you can still add them to the resource pool To do so, install an appropriate copy of Windows Server 2008 on the new host then, instead of using Hyper-V, install Microsoft Virtual Server to run the virtual machines The parallel network has several advantages First, it provides an ongoing rollback environment If, for some reason, the new network does not work properly, you can quickly return to the legacy environment because it is still up and running Next, you can migrate groups of users and machines according to your own timetable Since the existing network is still running, you can target specific groups without affecting others Also, since the existing network is still running, you can take the time to completely master new technologies and services before putting them in place And, since the new services are based on virtual machines, you can use trial and error until you get it exactly the way you like it It does have some disadvantages, though It takes more time than doing an in-place upgrade But if you want a better return on investment (ROI) at the end of your project, you will want to take the time to redesign your network to take full advantage of new WS08 features The parallel network is a harder sell in a migration project, but its advantages far outweigh its disadvantages in most situations Because you are migrating to VSOs, the parallel network makes sense because it lets you master the VSO concept before you put services in place Table 6-2 compares the upgrade to the parallel network The parallel network implementation process is outlined in 12
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Parallel Network Advantages Provides ongoing rollback environment Migrate groups and users on an as needed basis even support and administrative groups Migrate at your own speed Take advantage of new system features immediately Implement features in native mode Can deal with and repair existing issues Faster ROI Disadvantages Higher costs at first Design is more complex because it s a completely new network Two networks to manage Dual support methods last longer
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Lower costs Simpler to design, since all services exist already A single network to manage Dual support methods disappear faster
No simple rollback method Must migrate users all at once when upgrading authentication services (PDC) Gain only the new features that work in mixed mode Carry on existing issues into new network Slower ROI
TABLE 6-2 Parallel Network Versus Upgrade
Choose What to Migrate First
Of course, if your existing network is based on Windows 2000/2003 and you have taken the time to perform a proper migration to this operating system, your migration path to WS08 will be much simpler than the parallel network What you ll want to determine is which systems you will migrate first: identity servers, member servers, or PCs For one category of systems, PCs, the answer is easy If you re already using Windows XP Professional or Windows Vista, you won t have to touch PCs until you ve migrated the servers the PCs are linked to But the question still remains between identity and member servers: which to do first Since Windows Server 2008 supports multiple operating modes and is compatible with Windows NT, as well as with Windows 2000/2003, you could choose to migrate each category of server in any order Figure 6-5 illustrates the migration slide-rule This concept shows that identity servers, member servers, and PCs can be migrated in any order It also displays the relative migration timelines for each type of system, graphically demonstrating the duration of each migration process compared to the others The sliderule is used to demonstrate that each migration process can be moved from one place to another on the project timescale, allowing you to begin with the process that suits your organization best
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