The bridge to agent-scale Git infrastructure

GitHub is migrating its Git storage infrastructure to Azure in response to rapid traffic growth, data-center power limits, and supply-chain constraints, with most repositories now maintaining replicas in both Azure and GitHub’s own facilities and Azure serving about half of all Git traffic. The busiest remaining repositories have been difficult to move because cross-region latency slows their repository-wide serialized write process, so GitHub is shifting quorum coordination from the entire repository to individual Git references, allowing independent branch updates to proceed concurrently and yielding 3–4 times higher throughput in internal tests. The company is also beginning to decouple storage from compute by making Azure Blob Storage a durable “virtual replica” within the write quorum and introducing ephemeral virtual read replicas that can scale independently, cache data from object storage, and serve read-heavy workloads. These changes provide immediate capacity improvements while preparing for a broader redesign of GitHub’s write protocol, which must eventually reduce the remaining coordination required for reference updates while preserving consistency across more than a billion repositories.

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