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I currently have more than 10 EC2 instances with the same type (t2) and the same region (Ohio) and I am checking the best way to save in the monthly bill without losing performance.

I've checked Reserved Instances (RI), but T2 is only available as shared tenancy (Sharing the Hardware).

My questions are,

  • Can that affect the performance of my application deployed on that instance? What happens when the application has more load/requests?
  • Are Reserved Instances also working with shared tenancy?
  • Does Reserved Instances service create instances or is it possible to buy, ie 10 RI T2 type to apply to my current instances?
kenlukas
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user1911
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  • I think there is some confusion on what shared tendency is. You are currently running your 10 instances on ST. Using RI does not change this. – Marcin Sep 16 '21 at 08:54

2 Answers2

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Main Points are,

Reserved instances are one of the types of purchase options available for EC2 instance to enable you to optimize your costs based on your needs.

Tenancy defines how EC2 instances are distributed across physical hardware and obviously it affects pricing. The main thing here, with a tenancy selected(say dedicated), you can also decide your purchase options(either spot or on-demand or reserved)

So answering your question based on the above statements,

  1. Can that affect the performance of my application deployed on that instance? What happens when the application has more load/requests? No it doesn't, It is totally based on the instance type that you've selected. When application has more load, try to add more instance or change the type of instance.

  2. Are Reserved Instances also working with shared tenancy? Yes, explained above.

  3. Reserved Instancies service is creates instances or it's possible to buy, ie 10 RI T2 type to apply to my current instances? It's just a pricing option.

you can read these two docs for getting a better understanding.

https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/instance-purchasing-options.html

https://aws.amazon.com/ec2/pricing/dedicated-instances/

Sam
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Can that affect the performance of my application deployed on that instance? What happens when the application has more load/requests?

No it can't. There is no effect.

Are Reserved Instances also working with shared tenancy?

It does not apply to you. RI is only pricing discount, not related to the fact whether you use shared tenancy, dedicated instances.

Reserved Instancies service is creates instances or it's possible to buy, ie 10 RI T2 type to apply to my current instances?

It does not create new instances. Its just a pricing discount.

Marcin
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