You have a new server named Server1 that runs Windows Server 2012 R2.
Server1 has two dual-core processors and 32 GB of RAM.
You install the Hyper-V server role on Server1.
You create two virtual machines on Server1 that each have 8 GB of memory.
You need to minimize the amount of time it takes for both virtual machines to access memory.
What should you configure on each virtual machine?
A.
Resource control
B.
Memory weight
C.
Dynamic Memory
D.
NUMA topology
Explanation:
Windows Server 2012 introduced support for projecting a virtual NUMA topology into Hyper-V
virtual machines. This capability can help improve the performance of workloads running on virtual
machines that are configured with large amounts of memory.
https://technet.microsoft.com/en-us/library/dn282282(v=ws.11).aspx
Non-Uniform Memory Access (NUMA) is a computer system architecture that is used with multiprocessor designs in which some regions of memory have greater access latencies. This is due to how the system memory and processors are interconnected. Some memory regions are connected directly to one or more processors, with all processors connected to each other through various types of interconnection fabric. For large multiprocessor systems, this arrangement results in less contention for memory and increased system performance.
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For this question people are saying either NUMA or Dynamic Memory. The question isn’t clear enough to be sure but from reading I’d go for Dynamic Memory. Although I wonder if it’s a badly worded question which really wants the NUMA answer.
Question says that the VM settings are to be changed: “What should you configure on each virtual machine?”.
I don’t see why changing any NUMA settings on the VM is needed, https://technet.microsoft.com/en-us/library/jj614459(v=sc.12).aspx says
“When a new virtual machine is created, Hyper-V specifies the default settings for virtual NUMA. These settings are in sync with the NUMA topology of the Hyper-V host.”
and
“NUMA spanning is enabled by default.”
People are pointing out that Dynamic Memory must be disabled on the VM. https://technet.microsoft.com/en-us/library/dn282282.aspx#BKMK_NUMA_DM says:
“Virtual NUMA and Dynamic Memory features cannot be used at the same time. A virtual machine that has Dynamic Memory enabled effectively has only one virtual NUMA node, and no NUMA topology is presented to the virtual machine regardless of the virtual NUMA settings.”
So I’m guessing that Dynamic Memory is the answer that MS are looking for.
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