> For the complete documentation index, see [llms.txt](https://huy312100.gitbook.io/software-development/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://huy312100.gitbook.io/software-development/cloud-service/aws/certificate/clf-c02/cloud-technology-and-services/ec2/ec2-instance-purchasing-options/reserved-instances.md).

# Reserved Instances

### Reserved Instances

• Up to 72% discount compared to On-demand

• You reserve a specific instance attributes (Instance Type, Region, Tenancy, OS)

• Reservation Period – 1 year (+discount) or 3 years (+++discount)

• Payment Options – No Upfront (+), Partial Upfront (++), All Upfront (+++)

• Reserved Instance’s Scope – Regional or Zonal (reserve capacity in an AZ)

• Recommended for steady-state usage applications (think database)

• You can buy and sell in the Reserved Instance Marketplace

### Convertible Reserved Instance

* Can change the EC2 instance type, instance family, OS, scope, and tenancy
* Up to 66% discount

> **Note**
>
> The % discounts are different as AWS change them over time – the exact numbers are not needed for the exam. This is just for illustrative purposes