Storage Had Gravity: How Atlas Infinite Makes Read Replicas Zero-Copy

MongoDB's Atlas Infinite pulls storage out of the compute node and turns adding a read replica from a full disk clone into an oplog tail. The architecture post behind it is a candid study in what disaggregation costs, and what it refuses to compromise on.

$ 2026.10.23 · 5 min read · #system design

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Storage Had Gravity: How Atlas Infinite Makes Read Replicas Zero-Copy

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