[neverhook]

Overview

Document how to deploy an external Mooncake EGM Store with MooncakeStoreConnector, using the existing NVLink allocator and GPU KV transfer path. Related to #45036.

Claims

• Add a standalone EGM Provider example and a deployment guide covering requester configuration, cross-instance prefix reuse, and shutdown.
• Keep the requester's existing positive local_buffer_size. The Provider owns the EGM capacity; its storage-only example uses zero local buffer.
• Limit the final diff to documentation and the Provider example. There are no changes to vLLM runtime code or tests.

Validation

• Provider CLI help, invalid capacity, setup arguments, signal handling, and setup/close error handling checked locally. Lifecycle checks used a fake Store; they do not exercise EGM transfers.
• Requester JSON checked through the existing MooncakeStoreConfig.from_file(); KV configuration JSON and example syntax checked.
• Ruff check/format, Markdownlint, and git diff --check passed.

.venv/bin/python examples/disaggregated/mooncake_store/egm_provider.py --help
pre-commit run ruff-check --files examples/disaggregated/mooncake_store/egm_provider.py
pre-commit run ruff-format --files examples/disaggregated/mooncake_store/egm_provider.py
npx --yes markdownlint-cli2@0.21.0 --config tools/pre_commit/.markdownlint.yaml docs/features/mooncake_store_connector_usage.md
git diff --check

Full pre-commit environment setup could not complete locally. The targeted checks above passed; commit hooks were bypassed.

The Mooncake GB200/NVL72 report published on August 18 records 208 successful HBM ↔ remote EGM Put/Get pairs across four GPUs on two GB200 nodes, including correctness, cleanup, and Fabric-health checks.

That report used Mooncake's batch_put_from / batch_get_into APIs with zero local buffer. The vLLM deployment described here, including multi-buffer transfers and cross-instance prefix reuse, has not been tested end to end on hardware.

Details

The connector already uses registered GPU buffers for its memory-replica multi-buffer transfers. Keeping the SDK's local staging allocation does not insert a CPU staging step into that path. The guide therefore uses the existing requester configuration without adding a zero-buffer exception or new allocator restrictions.

The example starts a separate Provider with Mooncake's EGM configuration API and closes it after the requesters exit.

The duplicate-work check covered #45036 and open EGM-related PRs; no equivalent deployment guide was found. AI assistance was used for the example, documentation, and local checks.

---

Pull Request Checklist

• I used vLLM's /pr-checklist skill. (Mandatory for agents, optional for humans).

• AI assistance was used during the creation of this PR.

• Design Fit: Minimizes impact on core components, reuses existing functionality, and justifies added complexity.

• Testing and Validation: Validates the change and ensures any added tests are meaningful and reliable, with CI coverage or documented CI resource constraints and validation performed outside CI.

• Code Quality and Style: Keeps code and comments clear and concise, and updates relevant documentation and examples.

• Pull Request Contents: Includes a brief summary and relevant links, supports claims with evidence, explains root causes and implementation trade-offs, and follows the contributing guide.

[mergify]

Documentation preview: https://vllm--63064.org.readthedocs.build/en/63064/

[github-actions]

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[claude]

Claude Code Review

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[LCAIZJ]

@NickLucche @ivanium Could you help take a look at this feature? I think it's pretty interesting.

[neverhook]

@NickLucche @ivanium Could you take a look at this PR and help enable CI? The pre-run check is still blocked by the contributor eligibility gate. Thanks!

[ivanium]

LGTM thanks! I pushed a small fix to move this section later as a separate part.

[github-actions]

✅ @neverhook, CI is now available for this PR.

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[ivanium]

/ci run

[github-actions]

✅ Triggered Buildkite CI #97548 for commit 656ca265ad3f.