The AWS EC2 instance size shows the number of hardware resources (capacity) provisioned to the instance. One EC2 instance type can contain multiple additional capabilities, for example, p3 dn.24xlarge. This means that this instance uses local Non-Volatile Memory Express (NVMe) solid-state drive (SSD) storage, which provides the highest performance of the storage subsystem for the instance. In our R5d.xlarge instance, d represents the additional capability. The bold letters can help you remember the associations. The letters used in the instance name and the associated properties are explained in the table below. Additional capabilityĪdditional capability represents additional hardware features for AWS machine types. Currently, the generation range for AWS EC2 instances is from 1 to 6, but generations 1, 2 and 3 may no longer be available for many instance types. It makes sense to use an older generation if you need to run EC2 instances on servers with specific hardware. In general, use the latest generation for your instances as it provides the best pricing and efficiency. As of February 2022, 6 is the latest generation for instances of the R family with generations 4 and 5 also still available. In our example, 5 is the instance generation of the R5d.xlarge instance. Usually, the last two or three generations are available. As Amazon deploys new servers in their data centers to provide the resources for running more instances by customers, these new servers have new hardware that is usually better than that of previous generations. This is true for instance families that have been available for a long time now. You may notice that many instance families have multiple generations (newer and older ones). Instance generationĪn instance generation represents instances of the same family running on servers of different hardware generations in AWS. One instance family can belong to only one EC2 instance type. One instance type can contain one or multiple families. This is a generic family for memory-optimized instances.Įach family provides its own hardware-backed features. R is the instance family or instance class in our example. It also identifies the ratio between hardware components (such as processor, memory and storage) in the instance specification. Let’s break down instance naming using the example of the R5d.xlarge instance.Īn EC2 instance family or instance class represents instances with a similar purpose. They are reflected in instance types and names.Īn EC2 instance type consists of multiple parameters: Servers have different hardware sets, and EC2 instances can use different amounts of hardware capacity. However, there is a logic behind the naming convention for AWS EC2 instances, and the name contains instance specifications.ĪWS EC2 instances are virtual machines running on physical servers in Amazon data centers. AWS EC2 instance types are represented as a mix of letters and digits. DISCOVER SOLUTION Classification of AWS EC2 TypesĪt first glance, AWS EC2 instance names look confusing. The latest pricing information for each AWS service is available at: AWS Pricing. This whitepaper provides an overview of how AWS pricing works across some of the most widely used services. You only pay for the services you consume, and once you stop using them, there are no additional costs or termination fees. AWS offers you a variety of pricing models for over 160 cloud services. Whether you're looking for compute power, database storage, content delivery, or other functionality, with AWS you pay only for the individual services you need, for as long as you use them, without complex licensing. These best practices by answering a set of questions for eachįor more expert guidance and best practices for your cloudĪrchitecture-reference architecture deployments, diagrams, andĪWS has the services to help you build sophisticated applications with increased flexibility, scalability, and reliability. UsingĪWS Well-Architected Tool, available at no charge in theĪWS Management Console, you can review your workloads against Secure, efficient, cost-effective, and sustainable systems. The six pillars of the Framework allow you to learnĪrchitectural best practices for designing and operating reliable, One of the main benefits of cloud services is the ability it gives you to optimize costs to match your needs, even as those needs change over time.ĪWS Well-Architected Framework helps you understand the prosĪnd cons of the decisions you make when building systems in theĬloud. Publication date: Febru( Document Revisions) AbstractĪmazon Web Services (AWS) helps you move faster, reduce IT costs, and attain global scale through a broad set of global compute, storage, database, analytics, application, and deployment services.
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