Exam 3V0-624 topic 1 question 5 discussion

Actual exam question from VMware's 3V0-624

Question #: 5
Topic #: 1

A database administrator is operating a virtual machine (VM) configured with 16 vCPU and 64GB of RAM. A recent performance audit has indicated that this virtual machine is oversized and is using less than 60% of its configured CPU and memory capacity.
✑ The ESXi host that contains this VM has 2 physical processors with 10 cores per processor, and 128GB of RAM.
✑ This physical host's architecture is split into two equal NUMA nodes.
Which vCPU and RAM configuration for the VM allows for the most resources, but also provides the performance benefit of local NUMA access?

A. 16 vCPU and 32GB RAM
B. 4 vCPU and 16GB RAM
C. 10 vCPU and 64GB RAM
D. 12 vCPU and 64GB RAM

Show Suggested Answer

Suggested Answer: B 🗳️

by duke_srg at Sept. 10, 2019, 6:08 p.m.

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diegof1

Highly Voted 5 years, 9 months ago

C is right. Because audit indicates that the VM is using less than 60% (9.6 vCPU and 38.4 GB of Memory), then the best configuration that takes into account the NUMA architecture is 10 vCPU with 64GB so that it is not generated Traffic between memory banks of physical processors. (10 cores because it is greater than 60% which is 9.6), in addition this configuration would be executed in single NUMA Node). https://blogs.vmware.com/performance/2017/03/virtual-machine-vcpu-and-vnuma-rightsizing-rules-of-thumb.html

upvoted 8 times

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duke_srg

Highly Voted 5 years, 9 months ago

Answer C is the right one in terms of NUMA locality and VM resources consumed

upvoted 5 times

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chafik

Most Recent 4 years, 3 months ago

Correct Answer: C

upvoted 1 times

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mariogg85

5 years, 1 month ago

IMHO the answer would be C. The VM has 16 vCPU and 64 GB RAM like it says on the statement the vm is using less of 60%. With this point we can deduce that this VM could be resized with 9 or 10 vCPU and 38-39GB RAM. It also indicates that they want to benefit from the benefits of the NUMA node (2 Nodes with 10 Cores and 64 GB each NUMA node). With this information the answer C is the right it should be resized to 10vCPU and 64 GB.

upvoted 2 times

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GodMan114

5 years, 4 months ago

I too like answer C. For a moment I was worried about ESXi overhead not being taken into consideration, but still seems to be the most logical answer.

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vmwarelive

5 years, 5 months ago

Correct Answer: C

upvoted 1 times

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Grande

5 years, 8 months ago

I agree with Deof1's analysis. A vCPU lower than 9.6 will mean VM is under-sized. C is correct

upvoted 1 times

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