Server Virtualization Implementations in .NET

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Server virtualization can be implemented in a variety of ways. Multiple virtual environments can be implemented using techniques including emulation, hard partitioning, OS virtualization, hosted mode, and hypervisors. All of these methods control access to host physical resources including processors, memory, network resources, storage, KVM, and local USB and/or serial port
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Part II
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A Closer Look
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connections. One of the benefits of server virtualization is that many of these implementations can support multiple different operating environments running at the same time, including Windows, Linux, BSD, and Solaris.
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Software emulation is the easiest to implement and the least efficient of the types of virtualization listed. It allows an operating system to run, unmodified, on top of or as a guest of an alternate platform or operating system. Emulators re-create an entire environment, including all CPU instructions and I/O devices, using software. This allows emulation of a different CPU environment, such as Windows software running on a non-Intel Mac. Emulators come with significant overhead, since every instruction must be translated and executed through the emulation process. Emulators are most often used when performance is not an issue for example, a Windows emulator running on a UNIX system. This provides the UNIX users the ability to run Microsoft Office applications on their desktop, enabling them to read (or write) Word documents attached to email messages. Their high overhead makes them cumbersome for operational environments. Many emulators are available on the market, often via open source channels for example, QEMU.
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Paravirtualization/Enlightened Operating Systems
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With this approach, the guest operating systems are modified to know they are running in a virtual environment. The guest operating system uses a special API to communicate with the virtualization layer and interface more directly with the hardware for example, the I/O subsystems. The guest operating system is modified to be aware that it is running virtualized, and performance can be significantly improved. The performance benefits, however, must be weighed against the need to modify the guest operating system.
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Partitioning of the system resources, either through hardware or software, is another approach for disaggregation within a single system. Either partitioning method creates multiple isolated servers, or partitions. Each partition is allocated one or more CPUs, a physical memory block, and specific I/O paths, and runs its own instance of the operating system. Resources are owned by the partition, without any sharing across partitions. Depending on the implementation, there may be the ability to have dynamic partitioning such that resources may be added to, moved to, and removed from a partition. Partitioning assumes all partitions run the same OS.
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OS Virtualization
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Operating system virtualization, such as Sun s Solaris Containers and SWsoft s Virtuozzo, is a complete virtualization at the OS layer and creates multiple virtual environments of the operating system. The instances have their own runtime environment while sharing both the system resources (which have been virtualized) and a base kernel. Since all virtual environments are sharing a single virtualized OS, rather than each virtual environment loading its own OS copy, overhead is minimal. OS support is limited to a single operating system for example, Solaris for Solaris Containers and either Linux or Windows (not both at the same time) for Virtuozzo. Through management interfaces, quality of service can be adjusted by allocating amounts of memory, CPU, and network bandwidth to specific virtual environments.
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Hosted Approach
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The hosted approach is a melding of emulation and OS virtualization in that there is a base operating system that runs under the virtualized environment. Hosted virtualization utilizes a layer that sits between the native operating system and the virtualized servers, allowing for multiple isolated virtual operating environments of different types to be run simultaneously (see Figure 8.1). The underlying operating system provides broad device support natively. However, since all I/O operations must pass through three levels of software (the virtual OS; the hosted virtualization layer in which the request is translated into something the host OS will understand; and the native OS), it is not a great option for I/Ointensive applications. Examples of hosted virtualization are Microsoft s Virtual Server and VMware Server (formerly VMware GSX).
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Virtual machine 1 Application Windows Virtual machine Virtual machine 2 Application Linux Virtual machine Virtual machine 3 Application Linux Virtual machine Virtual machine 4 Application Windows Virtual machine Virtual machine 5 Application Windows Virtual machine
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Virtualization layer (VMware Server, Microsoft Virtual Server, etc.)
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