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Exam AZ-301 topic 6 question 50 discussion

Actual exam question from Microsoft's AZ-301

Question #: 50
Topic #: 6

HOTSPOT -
You plan to deploy a network-intensive application to several Azure virtual machines.
You need to recommend a solution that meets the following requirements:
✑ Minimizes the use of the virtual machine processors to transfer data
✑ Minimizes network latency
Which virtual machine size and feature should you use? To answer, select the appropriate options in the answer area.
NOTE: Each correct selection is worth one point.
Hot Area:

Show Suggested Answer

Suggested Answer:

References:
https://docs.microsoft.com/en-us/azure/virtual-machines/windows/sizes-hpc#h-series

by AzureGC at Nov. 26, 2019, 6:45 a.m.

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Shiven

Highly Voted 5 years, 3 months ago

Correct Answers are Compute Optimized Standard F8s Single Root I/O Virtualization (SR-IOV) For this solution we need to ensure “Accelerated Networking” is applied on the virtual machines. The Microsoft documentation mentions the below supported series of Virtual Machines for the enabling Accelerated Networking. These supported series are: D/DSv2 , F/Fs, D/Dsv3, E/Esv3, Fsv2, Lsv2, Ms/Mms and Ms/Mmsv2. For Accelerated Networking, we need to enable “Single Root I/O Virtualization (SR-IOV)”

upvoted 43 times

yemma

5 years, 2 months ago

For this to be true, we have to know how much vCPUs do we have which is not mentioned in the question.

upvoted 1 times

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SilentH

Highly Voted 5 years, 4 months ago

Tough question that requires knowing what VM instance size supports SR-IOV vs. RDMA. Given the selection of VM types and features available, the only combination that would work is: * High performance computer Standard_H16r * Remote Direct Memory Access (RDMA) While it's true that SR-IOV would meet the requirement to minimize network latency, SR-IOV is not supported in any of the available VM sizes. Therefore, the right combo is what I listed above.

upvoted 24 times

CipherK

5 years, 4 months ago

SR-IOV are support on E16s_v3 and F8s Accelerated Networking is supported on most general purpose and compute-optimized instance sizes with 2 or more vCPUs. These supported series are: D/DSv2 and F/Fs On instances that support hyperthreading, Accelerated Networking is supported on VM instances with 4 or more vCPUs. Supported series are: D/DSv3, E/ESv3, Fsv2, and Ms/Mms. https://docs.microsoft.com/en-us/azure/site-recovery/azure-vm-disaster-recovery-with-accelerated-networking For E series, max NIC is 8, max speed is 8 Gbs which is slower than RDMA at all.

upvoted 4 times

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XJ

4 years, 10 months ago

You are right on the supported vm sizes - https://docs.microsoft.com/en-us/azure/virtual-machines/sizes-hpc

upvoted 1 times

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glam

Most Recent 4 years, 5 months ago

High performance compute Standard_H16r Remote Direct Memmory Access (RDMA)

upvoted 3 times

bruncili

3 years, 6 months ago

Correct, you should not configure Accelerated Networking or SR-IOV. Enabling Accelerated networking enables SR-IOV as a way to improve network performance by reducing overhead for processing, but it does not minimize the processor load.

upvoted 1 times

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sanketshah

4 years, 7 months ago

A and C correct. Compute Optimized Standard F8s : For this solution we need to ensure “Accelerated Networking” is applied on the virtual machines. The Microsoft documentation mentions the below supported series of Virtual Machines for the enabling Accelerated Networking. These supported series are: D/DSv2 , F/Fs, D/Dsv3, E/Esv3, Fsv2, Lsv2, Ms/Mms and Ms/Mmsv2. Single Root I/O Virtualization (SR-IOV) : For Accelerated Networking, we need to enable “Single Root I/O Virtualization (SR-IOV)”

upvoted 2 times

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BoxMan

4 years, 9 months ago

I'd go with these being correct based on the difficult question that it is (I'm CCIE and not really clear on what "Network-Intensive" implies) so HPC and RDMA: https://docs.microsoft.com/en-us/azure/virtual-machines/sizes

upvoted 3 times

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Rooh

4 years, 10 months ago

A and C

upvoted 3 times

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Rooh

4 years, 11 months ago

Feature should be SR-IOV

upvoted 1 times

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ercank

4 years, 11 months ago

The requirement here is to reduce the CPU workload so this can be achieved by RDMA, Google ref:"RDMA allows for communication between systems but can bypass the overhead associated with the operating system kernel, so applications have reduced latency and much lower CPU utilization. This results in much faster network performance rates than traditional TCP/IP." Since there is only one option which supports the RDMA which is H16 series so given answer I think correct.

upvoted 9 times

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gboyega

5 years ago

Compute Optimized SR-IOV

upvoted 2 times

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Rafael1984

5 years ago

I tested in my lab VM Standard F8s and supported Single Root I/O Virtualization (SR-IOV)

upvoted 2 times

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Neetiniti

5 years ago

Deployment considerations:Virtual network – An Azure virtual network is not required to use the compute-intensive instances. https://docs.microsoft.com/en-us/azure/virtual-machines/sizes-hpc#h-series

upvoted 1 times

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juri

5 years, 1 month ago

afaik RDMA is used in HPC environments and the question does not mention high performance computing. in generic network situation we'll use Compute Optimized Standard F8s and Single Root I/O Virtualization (SR-IOV)

upvoted 2 times

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DeveshSolanki

5 years, 1 month ago

Agree Shiven answer Compute Optimized Standard F8s Single Root I/O Virtualization (SR-IOV)

upvoted 3 times

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P0d

5 years, 2 months ago

For me answer is Compute optimized and SR-IOV. SR-IOV support VM instances with more vCPUs Fsv2 series machines.

upvoted 2 times

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VonBeanpaws

5 years, 2 months ago

As I see it, the question states that you need to minimize impact on the virtual CPU, which suggests RDMA, which then limits your available VM choice. The H option becomes the necessary one. You can easily overthink this, but I think the answer is correct.

upvoted 4 times

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abcdefghijkl

5 years, 3 months ago

RDMA on Azure Azure accelerated networking is build on top of SR-IOV (Single Root Input/Output Virtualization) hardware support provided by Mellanox ConnectX network cards

upvoted 1 times

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Daren

5 years, 4 months ago

You have to choose from the given answesers who seem ok, and these combination: SR-IOV with memory optimized VMs. Since memory optimized VMs cand be configured with less processors, I'd choose this option.

upvoted 2 times

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