With this objective in mind, this chapter will focus on providing an overview of both the different Windows Server R2 editions and the recommended hardware requirements. The first item of note for users familiar with the first version of Windows Server is that the R2 edition is only available for bit systems.
Whilst some editions of the original Windows Server operating system were available in bit versions, this is now no longer the case for the R2 version. The Foundation edition of Windows Server R2 is the new entry level edition and is designed specifically with the small business in mind. It is the least expensive of the various editions and lacks some of the more advanced functionality typically found in the higher end editions such as full Active Directory support and Hyper-V virtualization capabilities.
In addition, the Foundation edition limits some of the included features, such as restricting the number of concurrent remote desktop services connections to 50 and is able to access a maximum of 1 processor and 8GB of RAM. As previously stated, whilst the original version of Windows Server supported both bit and bit versions, the R2 version supports only bit processors.
Windows Server is primarily targeted at small and mid-sized businesses SMBs and is ideal for providing domain, web, DNS, remote access, print, file and application services. Support for clustering, however, is notably absent from this edition. The performance improvement is very noticeable in wide area network WAN situations on networks with high latency.
Because a typical transfer of files requires short read and write segments of data, a file could take minutes to transfer across a WAN that can transfer in seconds between SMB2-connected systems because the round-trip chatter is drastically reduced. Hyper-V is a technology built in to the core of the operating system in Windows Server and expanded in Windows Server R2 that greatly enhances the performance and capabilities of server virtualization in a Windows environment.
In the past, virtual server software sat on top of the network operating system and each guest session was dependent on many shared components of the operating system.
Hyper-V provides a very thin layer between the hardware abstract layer of the system and the operating system that provides guest sessions in a virtualized environment to communicate directly with the hardware layer of the system. Without having the host operating system in the way, guest sessions can perform significantly faster than in the past, and guest sessions can operate independent of the host operating system in terms of better reliability from eliminating host operating system bottlenecks.
Hyper-V and server virtualization is covered in more detail in Chapter 37, "Deploying and Using Windows Virtualization. A technology enhanced in the core Windows Server R2 operating system is a power-management technology called core parking. Normally, when a multicore server runs, all cores on all processors run at the highest speed possible, regardless of whether the server is being utilized.
For organizations that need high capacity during the weekdays when employees are working, that means their systems are effectively idle during evenings and weekends, or more than two thirds of the time, yet consuming power and expending heat.
With core parking, servers with the latest processors that recognize core parking protocols will shut down cores on a system when not in use. So, on a core server, if only 2 cores are needed, the other 14 cores are powered off automatically. This dramatically improves power management and decreases the cost of operations of server systems.
As much as there have been significant improvements in Windows Server R2 under the hood that greatly enhance the performance, reliability, and scalability of Windows Server R2 in the enterprise, Windows servers have always been exceptional application servers hosting critical business applications for organizations. Windows Server R2 continues the tradition of the operating system being an application server with common server roles being included in the operating system. The various server roles in Windows Server R2 typically fall into three categories, as follows:.
This book focuses on the Windows Server R2 operating system and the planning, migration, security, administration, and support of the operating system. Windows Server R2 is also the base network operating system on top of which all future Windows Server applications will be built. Although Windows Server R2 provides a number of new server roles for application services, the release of Windows Server R2 also brings with it an update to Active Directory.
Unlike the shift from Windows NT to Active Directory a decade ago that required a major restructuring of domain functions, Active Directory R2 is more evolutionary than revolutionary.
AD R2 adds a handful of new features that organizations might or might not choose to upgrade to AD R2 immediately; however, many organizations have found that the new enhancements in Active Directory R2 were the primary reason for their migration.
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Generally, users may not opt-out of these communications, though they can deactivate their account information. Contents Exit focus mode. Is this page helpful? Please rate your experience Yes No. Any additional feedback? In this article. Windows 8. Windows Vista: Limited only by kernel mode virtual address space and physical memory. Limited by available kernel-mode virtual address space or the SystemCacheLimit registry key value. Windows Vista: Limited only by kernel mode virtual address space.
Starting with Windows Vista with SP1, system cache virtual address space can also be limited by the SystemCacheLimit registry key value.
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