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Exam AZ-300 topic 16 question 2 discussion

Actual exam question from Microsoft's AZ-300

Question #: 2
Topic #: 16

A company plans to use third-party application software to perform complex data analysis processes. The software will use up to 500 identical virtual machines
(VMs) based on an Azure Marketplace VM image.
You need to design the infrastructure for the third-party application server. The solution must meet the following requirements:
✑ The number of VMs that are running at any given point in time must change when the user workload changes.
✑ When a new version of the application is available in Azure Marketplace it must be deployed without causing application downtime.
✑ Use VM scale sets.
✑ Minimize the need for ongoing maintenance.
Which two technologies should you recommend? Each correct answer presents part of the solution.
NOTE: Each correct selection is worth one point.

A. single storage account
B. autoscale
C. single placement group
D. managed disks

Show Suggested Answer

Suggested Answer: BD 🗳️

by sasi at Nov. 8, 2019, 1:26 p.m.

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gbabes

Highly Voted 5 years, 5 months ago

B and D Introduction to Azure managed disks https://docs.microsoft.com/en-us/azure/virtual-machines/windows/managed-disks-overview "Using managed disks, you can create up to 50,000 VM disks of a type in a subscription per region, allowing you to create thousands of VMs in a single subscription. This feature also further increases the scalability of virtual machine scale sets by allowing you to create up to 1,000 VMs in a virtual machine scale set using a Marketplace image."

upvoted 26 times

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ChinaBandit

Highly Voted 5 years, 6 months ago

C is incorrect. Single placement group has a maximum of 100VM.

upvoted 10 times

JatinA

5 years, 5 months ago

It is no 100 but 1000. So, C is correct https://docs.microsoft.com/en-us/azure/virtual-machine-scale-sets/virtual-machine-scale-sets-placement-groups

upvoted 2 times

andyR

4 years, 7 months ago

placement groups - you are over thinking

upvoted 1 times

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onlyfunmails

5 years, 5 months ago

With Single placement group, max VMs are limited to 100. To have > 100 and < 1000, have to set singlePlacementGroup to false to use multiple placement groups. So B and D are correct. https://docs.microsoft.com/en-us/azure/virtual-machine-scale-sets/virtual-machine-scale-sets-placement-groups By default, a scale set consists of a single placement group with a maximum size of 100 VMs. If a scale set property called singlePlacementGroup is set to false, the scale set can be composed of multiple placement groups and has a range of 0-1,000 VMs. Large scale sets require Azure Managed Disks. Scale sets that are not created with Managed Disks require multiple storage accounts (one for every 20 VMs). Large scale sets are designed to work exclusively with Managed Disks to reduce your storage management overhead, and to avoid the risk of running into subscription limits for storage accounts.

upvoted 55 times

ercank

4 years, 10 months ago

Totally agree. plus "To make an existing virtual machine scale set capable of scaling to more than 100 VMs, you need to change the singlePlacementGroup property to false in the scale set model." so it is for sure we need singlePlacement to exceed 100 VMs

upvoted 2 times

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triptimandal01

4 years, 8 months ago

Totally agree. Large scale set need 'Single placement group' option t be false. and they require multiple storage accounts, hence managed disk is correct option. B and D

upvoted 2 times

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Musk

5 years, 5 months ago

Good point.Thanks!

upvoted 3 times

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Jasper666

Most Recent 4 years ago

AD is correct here. https://docs.microsoft.com/en-us/azure/virtual-machine-scale-sets/virtual-machine-scale-sets-placement-groups

upvoted 1 times

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toja1234

4 years, 8 months ago

B and D C not: By default, a scale set consists of a single placement group with a maximum size of 100 VMs. If a scale set property called singlePlacementGroup is set to false, the scale set can be composed of multiple placement groups and has a range of 0-1,000 VMs. https://docs.microsoft.com/en-us/azure/virtual-machine-scale-sets/virtual-machine-scale-sets-placement-groups#placement-groups

upvoted 1 times

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fiol82

4 years, 10 months ago

Why can't we use a storage account? Somebody please explain, thanks.

upvoted 1 times

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gboyega

4 years, 10 months ago

B and D

upvoted 4 times

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Prash85

5 years ago

Minimum maintenance & reduce latency - it is B & D

upvoted 4 times

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Rishabhjain

5 years, 1 month ago

B and D is the correct answer. Although Placement group does provide reduced latency, fault tolerance, it is not a specific requirement here. The requirement is to reduce management. For large number of VMs, that can be done through managed disks.

upvoted 4 times

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milind8451

5 years, 1 month ago

B and D are right. Placement group are proximity group who ensure that VMs are as close as possible in datacenter to reduce latency. Question ask about minimum maintainence so managed disk is a right choice. Don't know why people choosing "C" here.

upvoted 3 times

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kimiura

5 years, 6 months ago

B and C

upvoted 2 times

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sasi

5 years, 7 months ago

B and C Placement Group And Autoscale is the correct answer

upvoted 8 times

tartar

4 years, 9 months ago

BD is ok

upvoted 4 times

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