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Best Practices for Virtualizing and Managing Exchange 2013

Compute Considerations

Organizations need virtualization technology that can support the massive scalability requirements of a

demanding Exchange 2013 deployment. One of the key requirements to virtualizing such workloads is to

have a large amount of processing and memory power. Therefore, when planning to virtualize mission-

critical, high-performance workloads, you must properly plan for these compute resources.

Logical Processors on Hardware

Logical processors are representations or abstractions of a processor’s physical cores themselves or of the

number of threads that can be handled by a single physical core of a processor. Windows Server 2012 can

run on host servers supporting up to 320 logical processors. With Windows Server 2012, there is no

enforced limit on the virtual processor to logical processor (VP:LP) ratio. Users can have as many virtual

processors associated with a logical processor as the hardware will allow. However, it is better to test the

VP:LP ratio compatibility of the workload that needs to be virtualized to a level where the performance is

not adversely affected. For any virtual machine in an Exchange 2013 deployment, we recommend a

ratio of 1:1, but a ratio of up to 2:1 is officially supported. Oversubscribing the CPU on the

virtualization host can decrease performance, depending on how much the CPU is oversubscribed.

Hyper-V also benefits from larger processor caches, especially for loads that have a large working set in

memory and in virtual machine configurations where the VP:LP ratio is high.

Customers can use processors that support Second Level Address Translation (SLAT) technologies (that

is, SLAT-based processors). SLAT technologies add a second level of paging functionality under the

paging tables of x86/x64 processors. They provide an indirection layer that maps virtual machine memory

addresses to physical memory addresses, which reduces load on the hypervisor for address translation

(Figure 2).

Figure 2: Virtual memory and SLAT

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Dell System 220e Spezifikationen Seite 12