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Deployment Scenarios
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In general, you will perform automated Windows 7 deployments in four scenarios: Upgrade Computer (in-place upgrade), New Computer (wipe-and-load), Refresh Computer, and Replace Computer . The following sections provide an overview of each scenario .
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Upgrade Computer Scenario
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You can upgrade from Windows Vista Service Pack 1 (SP1) to Windows 7 in place, which means you can install Windows 7 and retain your applications, files, and settings as they were in your previous version of Windows Vista . If you want to upgrade from Windows XP to Windows 7, however, you will need to use the Refresh Computer scenario, which preserves files and settings but not applications . For more information, see the section titled Refresh Computer Scenario later in this chapter . Although upgrading might be the simplest way to deploy Windows 7, you run the risk of preserving misconfigurations and unauthorized software or settings . In many cases, the existing system configuration is difficult to assess and change-control processes are more difficult
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Deployment Scenarios CHapTER 3
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to implement . Upgrading from Windows Vista with Service Pack 1 computers in an unknown state to Windows 7 does not change the computer s status its state is still unknown . A better scenario for managed environments is to use the New Computer scenario with user state migration to preserve settings selectively (that is, the Refresh Computer scenario) .
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In the New Computer scenario, you install a clean copy of Windows 7 on a clean (freshly partitioned and formatted) hard drive . This scenario has the most consistent results, creating a configuration in a known state . Installing a known configuration on a clean computer is the foundation of good configuration management . You can use established change-control processes to manage any subsequent changes closely .
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The Refresh Computer scenario is similar to the New Computer scenario . The differences are that the destination computer contains a Windows operating system, and this scenario preserves users existing files and settings, as shown in Figure 3-3 .
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Scanstate Collects User State
Store Location
Loadstate Restores User State
Reloaded Computer
FIgURE 3-3 Preserving user state during migration
You can use migration technologies, such as USMT 4 .0, to migrate users files and settings from the previous version of Windows to Windows 7 . This helps ensure that no data is lost while still establishing the best possible system configuration . For more information about using USMT 4 .0, see 7, Migrating User State Data . You can think of the Refresh Computer scenario as combining the benefits of a new installation that the New Computer scenario provides with the benefits of preserving files and settings .
CHapTER 3
Deployment Platform
Replace Computer Scenario
Windows migration technologies such as the Windows Easy Transfer tool and USMT 4 .0 allow side-by-side data migration between an old computer running Windows XP or Windows Vista and a new computer running Windows 7 . This scenario, which is called Replace Computer, allows you to perform a clean installation on the new computer and simply migrate files and settings from the old one . Figure 3-4 shows an overview of this scenario .
Scanstate Collects User State Store Location
Loadstate Restores User State
Old Computer
New Computer (with New Operating System)
FIgURE 3-4 Side-by-side upgrades begin with a clean, new system .
Understanding Setup
To automate Windows Setup, you must first understand the installation process . Knowing the underlying process will help you understand the decisions you must make when developing Windows 7 for deployment . The Windows 7 installation process is simple . All editions of Windows 7 use the same installation image (Install .wim in the Sources folder of the installation media), but Microsoft is shipping edition-specific media . As a result, you can install only one edition of Windows 7 through the user interface, but you can use an Unattend .xml file to install a different edition . The installation process is divided into three phases: Windows PE, Online Configuration, and Windows Welcome . Windows Setup runs in phases, which the following sections describe . These phases Preinstallation Phase, Online Configuration Phase, and Windows Welcome Phase occur in order and simply designate a point in the installation process . Windows Setup also has configuration passes . Each configuration pass performs a specific function and applies related settings from the Unattend .xml answer file .
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