GitHub moves its busiest Git repositories to Azure with per-reference write quorum

GitHub says it has moved 99.99999% of its Git repositories to Azure, and that the busiest remaining ones were held back by cross-region latency.

In an X post from @github, GitHub describes a new write path that serializes writes per reference instead of per repository. GitHub says this raised write throughput 3–4x in internal tests. The change also enables stateless Azure Blob Storage replicas that GitHub says scale reads independently.