Windows Server 2008 R2 is a server operating system produced by Microsoft. It was released to manufacturing (RTM) on July 22, 2009 and launched on October 22, 2009. According to the Windows Server Team blog, the retail availability was September 14, 2009. It is built on Windows NT 6.1, the same kernel used with the client-oriented Windows 7. It is the first 64-bit-only operating system released from Microsoft.
Version enhancements include new functionality for Active Directory, new virtualization and management features, version 7.5 of Microsoft IIS Web Server and support for up to 256 logical processors. There are seven editions: Foundation, Standard, Enterprise, Datacenter, Web, HPC Server, Itanium and Windows Storage Server 2008 R2 (Essentials Edition).
Preinstallation information
System requirements
Processor
Processor performance depends not only on the clock frequency of the processor, but also on the number of processor cores and the size of the processor cache. The following are the processor requirements for this product:
Minimum: 1.4 GHz 64-bit processor
Note
An Intel Itanium 2 processor is required for Windows Server 2008 R2 for Itanium-Based Systems.
RAM
The following are the estimated RAM requirements for this product:
Minimum: 512 MB
Maximum: 32 GB (for Windows Server 2008 R2 Standard) or 2 TB (for Windows Server 2008 R2 Enterprise, Windows Server 2008 R2 Datacenter, and Windows Server 2008 R2 for Itanium-Based Systems).Disk space requirements
The following are the estimated minimum disk space requirements for the system partition.
Minimum: 32 GB Note
Be aware that 32 GB should be considered an absolute minimum value for successful installation. The system partition will need extra space for any of the following circumstances:
- If you install the system over a network.
- Computers with more than 16 GB of RAM will require more disk space for paging, hibernation, and dump files.
- If you install the Windows Server 2008 R2 for Itanium-Based Systems edition.
When deciding if the disk space minimum for the operating system is appropriate, you should take into account several additional variables:
- The installed RAM, which will influence the space required for paging, hibernation, and dump files
- Servicing requirements—specifically, whether you plan to install all available updates, only critical updates, or service packs, as well as on what schedule, be it monthly, quarterly, or with a different frequency
- The planned life of the server, since you must allow for long-term growth of the system partition as updates are installed
- Anticipated upgrades to subsequent versions of the operating system, since in-place upgrades often require more disk space to complete than they will use once installation has finished
- The number and size of any non-Microsoft drivers and associated tools
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