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Based on your actual business workflow requirement, determine the required cluster size, raw capacity, and performance. You should consider the future growth of your business needs when planning your deployment. It is easier to determine the cluster raw capacity than cluster performance.
In general, cluster performance is related to your cluster size, instance type, and EBS volume configuration. More cluster nodes deliver higher throughput and IOPS. The higher instance size has a higher bandwidth limit.
For more cluster performance considerations and performance test results, see the document APEX File Storage for AWS - Overview and Performance.