S3-based databases cache in memory and NVMe, making disk vs S3 latency gap smaller than expected

mgill25 · x · 2026-11-04

Pekka Enberg explains why S3-based database architectures stay competitive: reads are amortized via memory and local NVMe caching, so read performance roughly matches local-disk setups with only heavier tail latency, while writes already require a network round trip for replication—making the S3 penalty smaller than commonly assumed, especially with S3 Express.

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