Core concept
i4i: fast NVMe for DBs. im4gn/is4gen: Graviton NVMe. c/m/r 'd' suffix: NVMe attached to compute/memory instances.
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How it works
Data loss on stop. Replicate for durability. Backup to S3/EBS regularly. Not for primary durable storage.
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Trade-offs + gotchas
Cassandra + Kafka commit logs. Distributed DBs with replication. Cache tier. Local scratch for ML/analytics.