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Exam AZ-304 topic 4 question 6 discussion

Actual exam question from Microsoft's AZ-304

Question #: 6
Topic #: 4

HOTSPOT -
You have a virtual machine scale set named SS1.
You configure autoscaling as shown in the following exhibit.

You configure the scale out and scale in rules to have a duration of 10 minutes and a cool down time of 10 minutes.
Use the drop-down menus to select the answer choice that answers each question based on the information presented in the graphic.
NOTE: Each correct selection is worth one point.
Hot Area:

Show Suggested Answer

Suggested Answer:

Box 1: 20 Minutes.
10 minutes cool down time after the last scale-up plus 10 minutes duration equals 20 minutes.

Box 2: 9 -
30% does not match the scale in requirement of less than 25% so the number of virtual machines will not change.

by dadageer at April 30, 2021, 11:39 p.m.

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jugha

Highly Voted 4 years, 3 months ago

Answers seem to be correct. Box 1: 20 Minutes Box 2: 9

upvoted 68 times

Hattuma

4 years, 2 months ago

See https://docs.microsoft.com/en-us/azure/virtual-machine-scale-sets/virtual-machine-scale-sets-autoscale-portal Duration =The amount of time monitored before the metric and threshold values are compared. Does not include cool down period.

upvoted 4 times

InsJatilYadav

4 years, 2 months ago

I agree with @jugha. Docs saying "doesn't include" means we will need to include it in our calculation. So 20mins.

upvoted 5 times

erunit

4 years, 2 months ago

I disagree. at https://docs.microsoft.com/en-us/azure/virtual-machine-scale-sets/virtual-machine-scale-sets-autoscale-portal the sentence says: "Cool down (minutes) The amount of time to wait before the rule is applied AGAIN so that the autoscale actions have time to take effect." (please look and focus to word AGAIN), if we assume that is first time that rule was applied then we should not consider that amount of time, so... 20 minutes it's correct

upvoted 1 times

BieLey

3 years, 11 months ago

But it is not the first time the rule is applied. Since it got scaled in from 6 to 9.

upvoted 4 times

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AzureGuri

3 years, 10 months ago

Box 1: 10 minutes, as the default instance is 6

upvoted 6 times

student22

3 years, 9 months ago

I think the given answer is correct. 10min cool down and then 10min more to trigger = 20min

upvoted 3 times

rdemontis

3 years, 8 months ago

I think it is correct 10 minutes because the cooldown take effect only after a scale operation.https://docs.microsoft.com/en-us/azure/azure-monitor/autoscale/autoscale-understanding-settings Since the default is 6 VM instances at start you don't need to wait for cooldown period

upvoted 5 times

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agente232

3 years, 7 months ago

so 10 min to cool down, everybody is clear here, now the rule is applied again in 10 min but it needs 10 min more gathering data in order to validate the metric and threshold value therefore 20 mins

upvoted 6 times

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anupam77

3 years, 5 months ago

Correct Answer Given. Once SS1 has already Scaled out to 9 VM's. It will then have 10 minutes Cool Down Period (where it won't do anything). Then it will take another 10 minutes minimum to wait and observe the CPU utilization and will scale out further if CPU is more than 75 percent for that 10 mins duration. Hence in total = 20 minutes

upvoted 6 times

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dadageer

Highly Voted 4 years, 3 months ago

The first one is 10 minutes!

upvoted 52 times

ReginaldoBarreto

4 years, 3 months ago

cool down time of 10 minutes....

upvoted 5 times

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crazyaboutazure

4 years, 1 month ago

correct 10 minutes for scale out and 20 min to scale back in if it will.

upvoted 3 times

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jp_mcgee

Most Recent 2 years, 9 months ago

Scales to 9 from Default-6 or scales to 9 from minimum-3? The question doesn't say the VM count dropped from default to minimum. If scaling from default-6, then .... BOX 1: 10 Minutes BOX 2: 9

upvoted 1 times

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sapien45

3 years, 2 months ago

Box 1: 10 Minutes Box 2: 9

upvoted 2 times

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[Removed]

3 years, 5 months ago

Correct answer

upvoted 1 times

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icedog

3 years, 5 months ago

Box 1: 20 minutes* Box 2: 9 * Duration The amount of time monitored before the metric and threshold values are compared. Does not include cool down period. https://docs.microsoft.com/en-us/azure/virtual-machine-scale-sets/virtual-machine-scale-sets-autoscale-portal

upvoted 8 times

exnaniantwort

3 years, 4 months ago

best clearest explanation

upvoted 2 times

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Kubernetes

3 years, 6 months ago

10Min / 9 VMs

upvoted 3 times

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jmay

3 years, 6 months ago

"if SS1 scales to nine VM" - it does not even say scales from how many instances... assume the set is running on the default 6 instance and has been stable, and all of a sudden the load increases and you need 9 VMs, how fast will the Sacle Set to complete this change? Obviously, you only need to wait for 10 mins since the sudden increase of load.

upvoted 2 times

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blueeagle8

3 years, 6 months ago

For Box1, the minimum should be 10 minutes. The actual time is depended on when the last scale action is taken place. If it just scaled out (increased from 6 cpu to 9 cpu), then it will need 10+10 =20 minutes to scale out again (assuming the cpu % is greater than 75 throughout this period). The question is asking for the minimum time to scale out again and we could assume that the last scaled out happened more than 10 minutes ago, as the question did not specify when the last scale action took place.

upvoted 2 times

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Dpejic

3 years, 7 months ago

On exam 24.12.2021

upvoted 2 times

anthonyphuc

3 years, 7 months ago

so what was your answer?

upvoted 1 times

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roland303

3 years, 9 months ago

"Duration - The amount of time monitored before the metric and threshold values are compared. *Does not include cool down period.*" So, 20 mins.

upvoted 2 times

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tallurhi

3 years, 9 months ago

Duration:The amount of time monitored before the metric and threshold values are compared. Does not include cool down period. 10 minutes. So it will first wait for 10 mins to do the comparision again .Once done if the condiiton is satisfied it will check for cool down counter and if that is true as well then does the action

upvoted 1 times

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willdy123

3 years, 9 months ago

I tested this in the lab (https://imgur.com/a/xJLyAvY). With duration 10 minutes and cooldown 10 minutes, the scale up happens every 10 minutes. It is the same for the first round and all rounds of scale up. I suggest correct answer Box1: 10 Minutes, Box2: 9

upvoted 13 times

examineezer

3 years, 9 months ago

I’m convinced. Thank you

upvoted 1 times

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MasterArmSwitch

3 years, 9 months ago

Thanks :)

upvoted 1 times

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ranhara

3 years, 9 months ago

If SS1 scales to whatever, what is the time to NEXT scale out ?

upvoted 1 times

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sharepoint_Azure_pp

3 years, 10 months ago

Box 1: 20 min Box-2: 9 machine is correct, choose the same cleared with 900 on 17th October 2021

upvoted 6 times

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waqas

3 years, 10 months ago

10 mins and 9

upvoted 2 times

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syu31svc

3 years, 10 months ago

https://docs.microsoft.com/en-us/azure/azure-monitor/autoscale/autoscale-understanding-settings scaleAction cooldown The amount of time to wait after a scale operation before scaling again. For example, if cooldown = “PT10M”, Autoscale does not attempt to scale again for another 10 minutes. The cooldown is to allow the metrics to stabilize after the addition or removal of instances. 1st dropdown is 10 minutes Since none of the scaling conditions are met, the number of virtual machines in the scale set will remain the same 2nd drop down is 9

upvoted 1 times

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