Win server 2012 standard x 64- bit /5 CALS ,Sever 2012 Datacenter
Windows Server 2012 R2:
Windows Server 2012 R2 was released on October 18, 2013. It was
unveiled on June 3, 2013 at TechEd North America. According to
Windows Server 2012 R2 datasheet published on May 31, 2013, there
are four editions of this operating system: Foundation, Essentials,
Standard and Datacenter. As with Windows Server 2012, the
Datacenter and Standard editions are feature identical, varying
only based on licensing (particularly licensing of virtual
instances). The Essentials edition has the same features as the
Datacenter and Standard products, with some restrictions.
A further update, formally designated Windows Server 2012 R2
Update, was released in April 2014,a cumulative set of security
updates, critical updates and updates.
Windows Server 2012 R2 is succeeded by Windows Server 2016.
Changes from Windows Server 2012
Microsoft has confirmed the following changes introduced by Windows
Server 2012 R2:
Automated Tiering: Storage Spaces stores most frequently accessed files on fastest physical media
Deduplication for VHD: Reduces the storage space for VHD files with largely similar
contents by storing the similar contents only once
Windows PowerShell v4, which now includes a Desired State Configuration (DSC) feature
Integrated Office 365 support (Essentials edition)
User interface changes from Windows 8.1, including visible Start button
UEFI-based virtual machines
Upgrades from driver emulators to synthetic hardware drivers to
minimize legacy support
Faster VM deployment (approximately half the time)
Internet Information Services 8.5: Support for logging to Event Tracing for Windows and the ability to log any request/response headers. To improve
scalability, if IIS is configured with 100 or more web sites, by
default it will not automatically start any of them. Alongside
this, a new "Idle Worker Process Page-Out" configuration option has
been added to application pools to instruct Windows to page-out the
process if it has been idle for the idle time-out period (by
default, 20 minutes).
Server Message Block: Performance and event logging quality improvements, support for
Hyper-V Live Migration over SMB, bandwidth prioritization
management, and the ability to remove SMB 1.0 support
Windows Deployment Services: Support for managing WDS via PowerShell.
Windows Defender is available in a Server Core installation, and is installed and enabled by default.
IP Address Management (IPAM): Extended to support role-based access control, allowing for fine-grained control over which users can view or
change configurations for DHCP reservations, scopes, IP address
blocks, DNS resource records, etc. Additionally, IPAM can integrate
with System Center Virtual Machine Manager 2012 R2 to have coordinated IP policy across both physical and virtual
environments. The IPAM database can be stored in a SQL Server instance instead ofWindows Internal Database.
Group Policy has a new "Policy Cache" setting which allows domain-joined
machines to store a copy of the group policy settings on the client
machine and, depending on the speed of access to the domain
controller, use those at startup time instead of waiting for the
policy settings to download. This can improve startup times on
machines that are disconnected from the company network. New Group Policy settings have been added to cover new features in
Windows 8.1 and Internet Explorer 11, such as enabling/disabling SPDY/3 support, configuring start
screen layouts, and detecting phone numbers in web pages.
TLS support is extended to support RFC 5077"Transport Layer Security (TLS) Session Resumption without
Server-Side State", which improves performance of long-running
TLS-secured connections that need to reconnect due to session
Hyper-V role and Hyper-V management console are added to the Essentials
Windows Server Update Services was made available for Windows Server 2012 R2 Essentials edition.
ReFS gained support for alternate data streams and automatic
error-correction on parity spaces.
Microsoft Windows Server 2012 Standard x64-bit
2 additional processors
Windows Server 2012 supports the following maximum hardware
specifications.Windows Server 2012 improves over its predecessor
Windows Server 2008 R2: