Amazon ElastiCache | Reserved Nodes Flashcards
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Reserved Nodes
Amazon ElastiCache | Database
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What are Amazon ElastiCache Reserved Nodes?
Reserved Nodes
Amazon ElastiCache | Database
With Reserved Nodes, you can now make a one-time, up-front payment to create a one or three year reservation to run your node in a specific Region and receive a significant discount off of the ongoing hourly usage charge. There are three Reserved Node types (Light, Medium, and Heavy Utilization Reserved Nodes) that enable you to balance the amount you pay upfront with your effective hourly price.
How are Reserved Nodes different from On-Demand Nodes?
Reserved Nodes
Amazon ElastiCache | Database
Functionally, Reserved Nodes and On-Demand Nodes are exactly the same. The only difference is how your Node(s) are billed; with Reserved Nodes, you make a one-time up-front payment and receive a lower ongoing hourly usage rate (compared with On-Demand Nodes) for the duration of the term.
How do I purchase and create Reserved Nodes?
Reserved Nodes
Amazon ElastiCache | Database
You can use the “Purchase Reserved Nodes” option in the AWS Management Console. Alternatively, you can use the API tools to list the reservations available for purchase with the DescribeReservedCacheNodesOfferings API method and then purchase a cache node reservation by calling the PurchaseReservedCacheNodesOffering method.
Creating a Reserved Node is no different than launching an On-Demand Node. You simply specify the node class and Region for which you made the reservation. So long as your reservation purchase was successful, Amazon ElastiCache will apply the reduced hourly rate for which you are eligible to the new node.
Will there always be reservations available for purchase?
Reserved Nodes
Amazon ElastiCache | Database
Yes. Reserved Nodes are purchased for the Region rather than for the Availability Zone. This means that even if capacity is limited in one Availability Zone, reservations can still be purchased in that Region and used in a different Availability Zone within that Region.
How many Reserved Cache can I purchase?
Reserved Nodes
Amazon ElastiCache | Database
You can purchase up to 20 Reserved Nodes. If you wish to run more than 20 Nodes please complete the Amazon ElastiCache Node request form.
What if I have an existing node that I’d like to convert to a Reserved Node?
Reserved Nodes
Amazon ElastiCache | Database
Simply purchase a node reservation with the same node class, within the same region as the node you are currently running and would like to reserve. If the reservation purchase is successful, Amazon ElastiCache will automatically apply your new hourly usage charge to your existing node.
If I sign up for a Reserved Node, when does the term begin? What happens to my node when the term ends?
Reserved Nodes
Amazon ElastiCache | Database
Pricing changes associated with a Reserved Node are activated once your request is received while the payment authorization is processed. You can follow the status of your reservation on the AWS Account Activity page or by using the DescribeReservedCacheNodes API. If the one-time payment cannot be successfully authorized by the next billing period, the discounted price will not take effect.
When your reservation term expires, your Reserved Node will revert to the appropriate On-Demand hourly usage rate for your node class and region.
How do I control which nodes are billed at the Reserved Node rate?
Reserved Nodes
Amazon ElastiCache | Database
The Amazon ElastiCache APIs for creating, modifying, and deleting nodes do not distinguish between On-Demand and Reserved Nodes so that you can seamlessly use both. When computing your bill, our system will automatically apply your Reservation(s), such that all eligible nodes are charged at the lower hourly Reserved Cache Node rate.
Can I move a Reserved Node from one Region or Availability Zone to another?
Reserved Nodes
Amazon ElastiCache | Database
Each Reserved Node is associated with a specific Region, which is fixed for the lifetime of the reservation and cannot be changed. Each reservation can, however, be used in any of the available AZs within the associated Region.
