Storage Optimized (D2)
- What it is
- High, sequential read/write access to very large datasets on locally attached disk.
- Measured in tens of thousands of low-latency random IOPS.
- Use cases
- Data warehousing, distributed file systems, Hadoop/MapReduce clusters.
- High-frequency OLTP systems, NoSQL databases with heavy local I/O.
- Key nuance: instance store, not EBS
- Storage is physically attached to the host — it is ephemeral.
- Stop or terminate the instance and the data is gone.
- Use Amazon Elastic Block Store (EBS) when the volume must survive the instance.
- Family letters
D— dense HDD storage (cheap capacity).I— NVMe SSD (high IOPS).H— HDD balance of compute and storage.