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How to calculate cost of Aurora headless cluster

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Hi, I want to create a cross region headless cluster using AWS Aurora Global database.
How can I calculate the cost for headless cluster using the AWS Pricing Calculator, since there is no option to select only storage ?

Thanks, Santosh

Topics
AnalyticsDatabase
Tags
Amazon Aurora Global DatabaseAmazon Aurora
Language
English
AWS

asked a year ago347 views

2 Answers
1
Accepted Answer

To estimate the cost of a cross-region headless cluster using AWS Aurora Global Database in the AWS Pricing Calculator, you’ll need to manually configure the components since the calculator doesn’t provide a direct “headless cluster” option. In a headless Aurora cluster, where no writer or reader instances are provisioned and only storage is used (for scenarios like DR or cross-region replication), you can focus on the storage and I/O costs. First, select Amazon Aurora in the calculator and configure the Global Database option. Then, for each region involved, specify the estimated amount of storage in GB under “Storage” (using Aurora’s default storage type, usually General Purpose SSD). You can also estimate the backup storage and I/O requests based on your expected usage. Make sure to set the instance count to zero or deselect instances if possible to simulate a headless configuration. While the calculator may still require at least one instance to be configured for some settings, you can use a minimal instance temporarily just to calculate base storage and I/O, and then exclude instance pricing manually in your internal cost estimates. Additionally, don’t forget to account for cross-region data transfer costs, which are incurred when replication traffic flows between primary and secondary clusters

answered a year ago

AWS
SUPPORT ENGINEER

reviewed a year ago

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When calculating costs for an Aurora Serverless cluster, you need to consider several components:

For Aurora Serverless v2, pricing is based on Aurora Capacity Units (ACUs). Each ACU represents approximately 2 GiB of memory with corresponding CPU and networking resources. You're billed for every second your database runs, with costs calculated per ACU-hour.

For a cross-region Aurora Global Database using Serverless, you would need to account for:

  1. ACU usage in each region - The primary region and each secondary region will incur ACU charges based on actual usage. If you're running in multiple Availability Zones, the ACU usage is cumulative (e.g., 1 ACU per AZ across 3 AZs would be 3 ACUs per hour).

  2. Storage costs - Aurora storage is billed per GB-month and is separate from compute costs.

  3. Data transfer costs - For a Global Database, you'll incur charges for data replicated between regions.

To estimate costs when there's no direct option in the AWS Pricing Calculator for a headless cluster:

  • Calculate the minimum ACU configuration you expect to use
  • Estimate your average ACU usage based on your workload patterns
  • Add storage costs (based on GB-month)
  • Include cross-region data transfer costs

For a more accurate estimate, you could:

  1. Set up a test environment with Aurora Serverless
  2. Monitor the actual ACU consumption over a few days of typical use
  3. Use CloudWatch metrics to observe scaling patterns
  4. Calculate costs based on the observed usage patterns

This approach will give you a more realistic cost projection than theoretical calculations alone.
Sources
Serverless relational database – Amazon Aurora DSQL pricing – AWS
Moving from Aurora to Aurora Serverless | AWS re:Post
RDS Aurora Serverless - Is cost multiplied by availability zone? | AWS re:Post

answered a year ago

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