ISV Products Citrix XenApp Microsoft App-V VMware ThinAppClient Client-Side Virtual Container How It Works Client-based model. Unlike a locally installed or streamed operating system, the virtual container is abstracted from the platform via a client-based virtual machine manager. Virtual machine images, including the operating system and applications, are created and managed centrally by IT and then delivered to the client, where they are stored and locally executed on a clientbased virtual machine manager (VMM). Changes from the client image can be synced with the centrally stored image and vice versa. Best Suited For Most environments. Provides mobile users with a centrally managed and secure image. Users get the performance benefits of local execution and IT benefits from centralized manageability. Enables multiple desktop images or work environments on the same PC, with secure isolation between the two environments to prevent cross infection. Examples: office workers who require separate operating environments with differing levels of security and management—for example, a personal and work environment, or a mobile contingent worker with a secured corporate image. Endpoint Considerations This delivery model has both Type 1 and Type 2 implementation; both require an intelligent client. In a Type 1 implementation, the VMM requires a thin operating system that runs at the silicon level of the endpoint. In a Type 2 implementation, the VMM requires a full-fledged operating system on the endpoint. Benefits Security: With isolated containers, viruses and threats are contained; IT can set policies for each container per users’ needs; patches/updates can be deployed on a central corporate image and easily distributed. Manageability: Operating system images, applications, and data management can be centralized for simpler administration, software migrations, and more reliable backup; image validation is only needed against the VMM; containers are highly portable, with simple installation. Performance: Subject to VMM efficiency, performance is virtually identical to locally installed applications; good computing/ graphics-intensive performance. Mobility: Containers can be cached and taken off-network; users can carry the container image on a USB drive and run it on any PC. Infrastructure cost: This model benefits from fewer servers, less storage, and reduced network requirements versus server-side models. Limitations Security: At runtime, data and applications are vulnerable to client-side attacks or theft; VMM layer must be protected. Performance: Running multiple virtual machines on a VMM may cause performance degradation. Maturity: New model technology, deployment and management tools, and IT processes are still evolving. Industry-wide technical challenges: Issues needing attention include virtualization of graphics, wireless, power management, docking stations, and peripherals. ISV Products Citrix XenClient Microsoft MED-V and Virtual PC 7 MokaFive Suite Virtual Computer NxTop Additional Delivery Models and ISVs In addition to the ISVs listed in this section, there are additional vendors whose products don’t fit neatly into the five delivery models discussed here. These vendors and products include: RES Software* (workspace management) Scense* (workspace management) Wanova Mirage* (hybrid desktop virtualization) 12 Intel IT Center Planning Guide | Desktop Virtualization
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