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SenthilnathTM-7429 asked GitaraniSharmaMSFT-4262 commented

Calculate required Application gateway instance count

We have an Azure Application gateway (WAF v1, Large). Metrics show the CPU utilization is less than 15%.

  1. Does this mean the App GW utilization is less?

  2. Based on this can i reduce the instance count?

Let me know if other factors/metrics needs to be considered.

azure-application-gateway
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1 Answer

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GitaraniSharmaMSFT-4262 answered GitaraniSharmaMSFT-4262 commented

Hello @SenthilnathTM-7429 ,

Welcome to Microsoft Q&A Platform. Thank you for reaching out & hope you are doing well.

1) Application gateway v1 CPU Utilization displays the utilization of the CPUs allocated to the Application Gateway. CPU usage should not regularly exceed 90%. You can indirectly control or improve CPU utilization by modifying the configuration of the Application Gateway by increasing the instance count or by moving to a larger SKU size, or doing both and vice-versa.
Refer : https://docs.microsoft.com/en-us/azure/application-gateway/application-gateway-metrics#metrics-supported-by-application-gateway-v1-sku

In your case, if the Metrics show the CPU utilization is less than 15%, then yes, this mean the Application utilization is less.

2) Yes, you can reduce the instance count if your Application utilization is less than 15%.

Points to be considered:

In case you are interested to migrate your Application gateway from v1 SKU to v2 SKU, you can refer the below article:
https://docs.microsoft.com/en-us/azure/application-gateway/migrate-v1-v2

Kindly let us know if the above helps or you need further assistance on this issue.


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Hello @GitaraniSharmaMSFT-4262 ,
Thanks for the answer. Will check the metrics & reduce the instance count.

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Hello @SenthilnathTM-7429 ,

Thank you for the update.

If this answers your query, please don’t forget to click "Accept the answer" and Up-Vote for the same, which might be beneficial to other community members reading this thread. And, if you have any further query do let us know.

Regards,
Gita

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