VMware Certified Professional - Data Center Virtualization (VCP-DCV) Practice Exam

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What advanced parameter configuration should be set in the virtual machine configuration file to address NUMA preferences?

  1. Set the Advanced Parameter numa.vcpu.preferH = TRUE in the virtual machine configuration file.

  2. Set the Advanced Parameter numa.vcpu.preferH = FALSE in the virtual machine configuration file.

  3. Set the Advanced Parameter numa.PreferH = 1 in the ESXi host configuration file.

  4. Set the Advanced Parameter numa.PreferH = 0 in the ESXi host configuration file.

The correct answer is: Set the Advanced Parameter numa.vcpu.preferH = TRUE in the virtual machine configuration file.

Setting the advanced parameter numa.vcpu.preferH = TRUE in the virtual machine configuration file helps optimize the performance of virtual machines in a Non-Uniform Memory Access (NUMA) environment. When this parameter is enabled, it directs the hypervisor to prefer placing the virtual machine's virtual CPUs (vCPUs) on the same NUMA node as the majority of the virtual machine's memory. This can lead to decreased memory access latency and improved overall performance, as it aligns the virtual computing resources more closely with the physical architecture of the underlying hardware. NUMA architecture is designed to improve performance by allowing processors to access local memory faster than remote memory. Thus, configuring the preference for vCPUs and memory to be on the same NUMA node enhances efficiency. This is particularly beneficial for workloads that require high memory bandwidth and low latency, thus making this parameter crucial for advanced VM configurations. The other options either configure preferences for not prioritizing local memory access or suggest changes in the ESXi host configuration, which do not directly address the NUMA preferences at the virtual machine level.

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