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would normally con ict at the name level, COM/DCOM and the services that rely on them can work seamlessly Virtual INI les Virtual Process Environment Virtual Fonts
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19 VIRTUALIZATION AND RESOURCE MANAGEMENT
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Figure 19-2 displays an application attempting to access the le system; the application has full access to the SystemGuard virtual le system, but only read access to the underlying OS le systems As shown in Figure 19-2, the application s les are available in the virtualized application s le system layer; however, dependencies of the application, such as common controls, are accessed via the underlying OS
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R+W Virtual File System (Overlay) C:\Program Files\Microsoft Office\Office12 Read only
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FIGURE 19-2 The le system layer from the SystemGuard in action This sounds great, but how does SoftGrid work, and how are these applications available on-demand If run locally on the PC, SoftGrid still needs the information available to create the layers just discussed Many components make up the SoftGrid solution:
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System Center Virtual Application Server Streams the SoftGrid-enabled applications to the clients, and checks whether a client is authorized for the application Clients query the virtual application server to nd out what applications are available; they
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can then place shortcuts in the client environment to allow users to initiate execution SoftGrid Data Store Used to store information about the SoftGrid environment SoftGrid Management Web Service The interface between the management console and the data store Uses NET Framework 11 or above and needs IIS 50 or above with ASPNET extensions enabled SoftGrid Client A locally installed service running on the user s machine; communicates with the virtual application server to receive the streamed application and caches it for use, even when the client is not connected to the network The client also contains the SystemGuard environment for run-time virtualized application execution SoftGrid Sequencer A wizard-based tool that creates the streamable application from the original application media
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The SoftGrid Sequencer is the rst step in virtualized applications; users of software like WinInstall are relatively familiar with it Sequencing an application for virtualization consists of three phases: 1 Enter information about the application at the package con guration stage This is just an information-gathering stage 2 Perform installation of the application, where the SoftGrid Sequencing wizard monitors the OS for installation changes (including le system changes, component registration, Registry changes, and so on) This installation must be performed on a clean OS No other applications can have ever been installed, even if they have been uninstalled (because les can be left behind) Remember, the process works by comparing differences on the computer before and after the application was installed If you install an application on a computer that already has components installed, the wizard will not see the added components, and thus won t add them to the virtualized application package When the virtualized application is run on another computer, the application stream is missing required information in the virtualized package and fails to run Additionally, because you are virtualizing an application that runs
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in overlay layers, the best practice is to create a new partition on the sequencing machine (for example, Q:) During the application installation, install it to the Q: drive via the advanced install option This Q: drive does not need to exist on the clients A virtual Q: drive is created by the SoftGrid environment for execution; it ensures no clashes with a computer s local le system This is not mandatory it s just a good practice 3 Launch the application on the sequencing computer This is important because a virtualized application is on-demand, so when the user runs a virtualized application for the rst time, all the data needed has to be streamed from a SoftGrid server Consider a full Word 2007 installation; this might be 100MB total size or more with all the various components, such as WordArt If you execute Word 2007, you need only about 50MB to launch, so run each application during the sequencing process This enables SoftGrid to see which installed pieces are needed to quickly launch the application SoftGrid prioritizes the data to stream to the client based on what is rst used (known as Feature Block 1 [FB1] of the stream) when the application starts This prevents waiting for the entire stream to be sent before the application can begin The rest of the application is then sent on-demand in 32KB chunks by default If you are streaming applications to mobile users, stream all the data to them locally This helps avoid the possibility of a user trying to run a piece of previously unused functionality with no way to pull down the required information You now have a complete sequenced application The administrator loads this sequenced application onto the SoftGrid server; he speci es which users and groups can use the application, where shortcuts for the application will be placed (for example, the desktop or the Start menu), and which le types are associated with the virtualized application
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