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Best Practices for Virtualizing and Managing Exchange 2013

Windows Server 2012 Hyper-V, the default virtual NUMA topology is optimized to match the NUMA

topology of the host/physical computer, as shown in Figure 27.

Figure 27: Guest NUMA topology by default matching host NUMA topology

The best practices below provide more guidance around managing varying CPU demand, reducing

overhead on the CPU, and optimizing processor performance for Exchange workloads.

Best Practices and Recommendations

Hyper-V publishes performance counters like Performance Monitor (Perfmon.exe) and

Logman.exe. These performance counters help to characterize the behavior of the virtualization

server and report resource usage. To measure CPU usage of the physical host, use the Hyper-V

Hypervisor Logical Processor performance counters. The Performance Tuning Guidelines for

Windows Server 2012 contain the list of available performance counters.

Do not oversubscribe the CPU for any virtual machine that you use in an Exchange 2013

infrastructure. Use a VP:LP ratio of 1:1 for optimum performance, but 2:1 is supported.

For any virtual machine that is running Exchange 2013 roles, detailed and accurate capacity

planning and sizing should be performed. This is to determine the correct amount of

processors/cores or, in this case, the minimum number of virtual CPUs that should be assigned to

the Exchange virtual machine. This value should be based on published guidance from the

Exchange team, such as that found on TechNet or the Exchange Team Blog on Sizing. The

Exchange 2013 Server Role Requirements Calculator also provides helpful guidance.

Although Exchange 2013 is not NUMA-aware, it takes advantage of the Windows scheduler

algorithms that keep threads isolated to particular NUMA nodes; however, Exchange 2013

does not use NUMA topology information.

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Dell System 220e Specifiche Pagina 46