Reserved Instances
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Reserved instances is a commitment from user to AWS for long term usage and AWS offers you discounted rate.
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Reserved instance pricing is determined by following variables/attributes
- Instance attributes: four instance attributes determine price
- Instance type
- Region
- Tenancy: shared or single
- Platform: Windows/Linux/Unix
- Term Commitment:
- One year
- Three year
- Payment Options:
- All Upfront: This is where you get max discount
- Partial Upfront:
- No Upfront:
- Offering Class:
- Standard: These provide more significant discount
- Some attribute such as instance size can be modified during term, instance family cannot be modified, You cannot exchange a Standard reserved instance, only modify.
- Convertible: The instance type can be exchanged for another convertible Reserved instance with different attributes
- Can be exchanged for other Convertible Reserved instance with new attributes including instance family, instance type, platform, scope or tenancy.
- Standard: These provide more significant discount
- Instance attributes: four instance attributes determine price
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Regional & zonal Reserved Instances (scope)
- Regional: Purchasing a reserved instance for a region
- Zone: Purchasing a reserved instance for a availability zone
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Purchasing Reserved Instances
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Usage Billing:
- In Reserved instances you are bill for every clock hour during the term, regardless of instance is running or not.
Scheduled Instances (Schedule Reserved Instances)
- This model enables you to purchase capacity reservations that recur on a daily, weekly or monthly basis, with specified start time and duration, for one-year term
- Schedule instances are supported only to C3, C4, M4 and R3.
- Minimum required time in an year is 1200 hours
- As of now Scheduled instances are available in N.Virginia, Oregon & Europe(Ireland)
Spot Instances
- A spot instance is an unused Ec2 instance that is available for less price.
- Spot instances can cost-effective choice when you run them as extra machines in your cluster, batch jobs etc..
Dedicated Hosts
- An Amazon Dedicated Host is a physical server with EC2 instance capacity full dedicated to your usage.
- Dedicated Hosts allow you to use your existing per socket, per-core or per-vm software license.
- Dedicated Host is
- billed per host
- Provides visibility of number of socket & physical cores
- Allow you to consistently deploy instances into same physical server
- Provides additional visibility & control over how instances are place over physical
- Bring your own license is supported.
Next Topic
- Savings plan
