3.1.2.1. EC2 Instance Types and Families

💡 First Principle: EC2 instance types and families provide diverse compute, memory, storage, and networking options. Their core purpose is selecting optimal resource configurations for workload performance and cost.

EC2 instance types and families provide diverse compute, memory, storage, and networking options. Their core purpose is selecting optimal resource configurations for workload performance and cost.

Amazon EC2 (Elastic Compute Cloud) offers a wide selection of instance types optimized for different use cases. Instance types comprise varying combinations of CPU, memory, storage, and networking capacity. Each family is designed for specific workloads.

Key EC2 Instance Families:

• General Purpose ("M", "T"): Balanced compute, memory, and networking resources. Good for web servers, small-to-medium databases. (M5, T3).
• Compute Optimized ("C"): High-performance processors. Ideal for compute-intensive tasks like batch processing, high-performance web servers, scientific modeling. (C5).
• Memory Optimized ("R", "X", "Z"): Large amounts of memory. Best for memory-intensive applications like high-performance databases, distributed web-scale in-memory caches, big data analytics. (R5).
• Storage Optimized ("I", "D", "H"): High sequential read/write access to large datasets on local storage. Suitable for data warehousing, distributed file systems, NoSQL databases. (I3, D2).

Scenario: For a CPU-intensive batch processing application, you would choose a compute-optimized C-family instance, whereas a high-performance in-memory database would benefit from a memory-optimized R-family instance.

Visual: EC2 Instance Families and Use Cases

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⚠️ Common Pitfall: Choosing the wrong instance family. For example, using a general-purpose instance for a compute-intensive workload, leading to poor performance and potentially higher costs (because it needs more instances to handle the load).

Key Trade-Offs:

• Performance (Specialized) vs. Cost (General Purpose): Specialized instance families (C, R, I) offer superior performance for specific workloads but are generally more expensive than general-purpose instances (M, T).

Reflection Question: How does selecting the correct EC2 instance type and family (e.g., between a General Purpose 'M' instance and a Compute Optimized 'C' instance) directly impact both application performance and operational costs by aligning resources with specific workload needs?