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Building Prometheus: How Backend Aggregation Enables Gigawatt-Scale AI Clusters

Building Prometheus: How Backend Aggregation Enables Gigawatt-Scale AI Clusters

• Backend Aggregation (BAG) centralizes Ethernet super spine to connect GPUs across regions. • BAG links Disaggregated Schedule Fabric (DSF) and Non-Scheduled Fabric (NSF) for unif

Building Prometheus: How Backend Aggregation Enables Gigawatt-Scale AI Clusters

Building Prometheus: How Backend Aggregation Enables Gigawatt-Scale AI Clusters

• We’re sharing details of the role backend aggregation (BAG) plays in building Meta’s gigawatt-scale AI clusters likePrometheus. • BAG allows us to seamlessly connect thousands of

Engineering Blogs · February 9, 2026 (updated February 25, 2026) · 2 min · 230 words