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Best Practices for Virtualizing and Managing Exchange 2013

Scalability Maximums of Windows Server 2012 Hyper-V

Windows Server 2012 Hyper-V provides significant scalability improvements over Windows Server 2008

R2 Hyper-V. Hyper-V in Windows Server 2012 greatly expands support for the number of host processors

and memory for virtualization—up to 320 logical processors and 4 TB physical memory, respectively. In

addition, Hyper-V includes support for up to 64 virtual processors and 1 TB memory per virtual machine, a

new VHDX virtual hard disk (VHD) format with a larger disk capacity of up to 64 TB, and additional

resiliency and alignment benefits when working with large sector disks. These features help to ensure that

Hyper-V as a virtualization platform provides the highest levels of performance for workloads that

customers may have previously thought could not be virtualized.

Table 1 highlights additional improvements by comparing the resources supported by Hyper-V in

Windows Server 2012 to those supported in Windows Server 2008 R2:

Table 1: Resources available across versions of Windows Server

Syste

Resource

Windows Server

2008 R2 Hyper-V

Windows Server

2012 Hyper-V

Improvement

Factor

Host

Logical Processors

320

5×

Physical Memory

1 TB

4 TB

4×

Virtual CPUs per Host

512

2,048

4×

Virtual CPUs per VM

16×

Memory per VM

64 GB

1 TB

16×

Active VMs per Host

384

1,024

2.7×

Guest NUMA

Yes

Cluster

Maximum Nodes

4×

Maximum VMs

1,000

8,000

8×

Significant improvements also have been made within Windows Server 2012 Hyper-V to support

increased cluster size and a higher number of active virtual machines per host. Windows Server 2012

Hyper-V supports up to 8,000 virtual machines on a 64-node failover cluster. This is eight times and four

times, respectively, the support provided by Windows Server 2008 R2.

In addition, more advanced

performance features, such as in-guest Non-Uniform Memory Access (NUMA), are supported by Windows

Server 2012 Hyper-V virtual machines. Providing these enhancements helps to ensure that customers can

achieve the highest levels of scalability, performance, and density for their mission-critical workloads.

Microsoft Assessment and Planning Toolkit

IT infrastructure for server virtualization requires proper planning, which includes gathering details related

to the hardware that resides in current environments. The Microsoft Assessment and Planning Toolkit

provides server utilization data for Hyper-V server virtualization planning; identifies server placements;

and performs virtualization candidate assessments, including return on investment (ROI) analysis for

server consolidation with Hyper-V.

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