Storage Optimized Instances
💡 Definition
Storage Optimized Instances are a family of EC2 Instance Types designed for workloads that require high sequential read and write access to very large local datasets. They deliver tens of thousands of low-latency, random I/O operations per second (IOPS) to applications.
🔑 Key Concepts
- High I/O Performance: Feature high-speed Non-Volatile Memory Express (NVMe) SSDs or large numbers of HDDs attached directly to the instance, providing extremely fast local storage.
- High Density Storage: Offer a very high storage-to-compute ratio, capable of storing massive datasets on the instance itself.
- Common Suffixes: Instance types often start with "I" (for I/O intensive) or "D" (for dense storage) (e.g.,
I3,D2,Im4gn,Is4gen).
⚙️ How it Works
These instances come with significant amounts of dedicated local storage, providing extremely fast disk performance. This local storage is typically instance store, meaning the data is ephemeral and tied to the instance's lifecycle. However, for applications designed to handle distributed data or data replication, this local performance is crucial.
🎯 Use Cases
- NoSQL Databases: Such as Cassandra, MongoDB, Redis, that require high performance and can handle data replication across instances.
- Distributed File Systems: Like HDFS (Hadoop Distributed File System).
- Data Warehousing: For applications like Amazon Redshift (though Redshift is a managed service, it uses similar underlying principles for its nodes).
- Analytics Workloads: Processing large datasets where fast local access significantly improves performance.
- Search Engines: Providing fast indexing and query capabilities for search clusters.
💰 Pricing Model
- Pricing follows the standard EC2 pricing models (On-Demand Instances, Reserved Instances, Spot Instances, Savings Plans), with costs reflecting the powerful hardware and high-performance storage.
📝 Exam Tips (CLF-C02)
- Keywords: "High sequential read/write", "Very large datasets", "NoSQL databases", "Data warehousing", "Local storage".
- Remember these instances are designed for applications that can leverage extremely fast local storage, even if that storage is ephemeral ([Instance Store]).
- Often contrasted with EBS volumes, which provide persistent network-attached storage.
See Also: * EC2 * Instance Types * EBS * Instance Store * Compute Optimized * Memory Optimized Instances