Exam AZ-300 topic 5 question 15 discussion

Got this question in AZ-303 beta. The Duration in minutes was mentioned in there as 5 minutes. Answer is 6 and 2.

Since the default time is 10 so the correct answer should be 4,4

answer will be 4,4 its specifically mentioned in the microsoft docs as " 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

Irrespective of default time, Box 2 will be 4. Scale in rule will run at 25% but it says reduce instance count by 4 which will make instance count 0 but minimum instance count is 2, so it won't do anything

I think that the answer is right: 6VM and 2 VM and the explanation is well to. I did it in lab and the option exist to configure the time, and this picture don't show it. The question mentioned 6 minutes, so we should assume 6 minutes was configured. I tested the way to customize the time of thresholds and change default values too: https://docs.microsoft.com/en-us/azure/azure-monitor/platform/autoscale-understanding-settings Besides that: INFO(Duration in minutes): This is amount of time that Autoscale engine will look back for metrics. For example, 10 minutes means that every time autoscale runs, it will query metrics for the past 10 minutes. This allows your metrics to stabilize and avoids reacting to transient spikes. The Storage queue Approximate Message Count and Service Bus Message Count metrics are special in that these metrics are point in time only and have no history. For these metrics, the duration field will be ignored by the Autoscale engine.

For Azure Cloud Services and Azure Virtual Machines, the default period for the aggregation is 45 minutes, so it can take up to this period of time for the metric to trigger autoscaling in response to spikes in demand. You can change the aggregation period by using the SDK, but periods of less than 25 minutes may cause unpredictable results. For Web Apps, the averaging period is much shorter, allowing new instances to be available in about five minutes after a change to the average trigger measure.

Its mentioned at Six minutes and if we need to assume the 6 minutes is the interval but not 5 or 10 minutes default value. If we consider defaul then mentioned minutes has no effect...if we go with 6 minutes as interval then instance count 4 plus cpu crossed 80% make 6 as answer for 1st condition. Explanation provided below seem to be fine though i was confused with 2nd condition..it ran for less than 30% for 1st 6 minutes and then 50% and in this case do we need to reduce the VM as the question demand scale set running condition..rather than what was the VM when cpu at 25% rate ?

6 and 2 is correct

Regarding to Box2, the point is "decreased by 4". It can't be decrease by 4 because initial number of VM is 4 and minimum number of VM is 2. It should be 4 VM. Duration time does not matter for Box2.

we should not assume that the defaults were taken. a number of people have posted and confirmed that the default duration is 5 or 10 minutes. Have they looked at the other defaults and compared with the question? For example, when creating a new VMSS in the portal, the default for CPU threshold scale out is 7. But in this question, the setting is 80. So why pick on one default and not recognise the other defaults. IMHO, the question mentioned 6 minutes, so we should assume 6 minutes was configured.

10/06/2020 default time is 10 min

Default scale in or out time is 10 mins hence 4 and 4

Yes, the default time duration is 10 minutes, so the answer should be 4 and 4.

There is no default time in Scale. It's just given minimal time. You configure it as you want.

There is no default value as such, the Scale out "Duration in Minutes" has to be a value between 5 to 60 minutes. Since it is shown here in the question, we should assume as minimum duration which is 5minutes and that explains the answers.

Very tricky ques, since duration time is not mentioned and default amount of time monitoring threshold values is 10 minutes and Since 6 minute time is mentioned here so correct ans is 4 and 4. i.e. Vm count will remain same, no changes.

Tricky question as the default Duration value not mentioned in the question. The page posted by andy0983011 is an example of 10 minutes. Scale set rule settings not posted in the question.