Grant
ae8efa1754
- image/ FastAPI app: /api/status, /api/swap, /api/swap/{id}/stream, /api/test-connection
- models.yaml: 5-model catalog (qwen3-vl, gemma4, qwen36, qwen3-235b-fp8, qwen25-72b)
- README, runbook, known-issues
- Dry-run swap verified against live Spark 1 (gemma4 currently loaded)
41 lines
2.0 KiB
Markdown
41 lines
2.0 KiB
Markdown
# Known issues
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## magpie-tts crash loop (Spark 2)
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The `magpie-tts` container at `nvcr.io/nim/nvidia/magpie-tts-multilingual:latest` is in a restart loop and `:9000` is not reachable. **Status as of 2026-05-12: unfixed. UI surfaces a red dot.**
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**Root cause (from `docker logs magpie-tts`):**
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```
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nimlib.exceptions.ManifestDownloadError: Error downloading manifest:
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I/O error Permission denied (os error 13)
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```
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The container exits 1 from `nimutils.download_models()` when fetching `nim/nvidia/magpie-tts-multilingual` model files from NGC. The "permission denied" is a local filesystem error — the container can't write the model cache where it expects to.
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**To diagnose further:**
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```bash
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ssh <spark-user>@<spark-2-ip>
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docker inspect magpie-tts | jq '.[].HostConfig.Mounts, .[].Config.Env'
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# Look for: the mount path for the model cache, and whether NGC_API_KEY is set.
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```
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**Likely fixes (untried):**
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1. Chown the bind-mounted cache directory on Spark 2 to the UID the container runs as.
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2. Set an `NGC_API_KEY` env var (NIM containers need this for non-public artifacts).
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3. Confirm there's free disk space.
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## Qwen3.6-35B-A3B `--moe_backend=flashinfer_cutlass` may fail on launch
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This flag is Blackwell-specific. If vLLM in the container reports `unrecognized arguments: --moe_backend` or similar, edit `models.yaml` for `qwen36` and drop that flag. The swap UI does NOT auto-fallback in v0.1 — failure surfaces in the log stream.
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## Two SSH paths to Spark 1 from the laptop
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`ssh <spark-user>@<spark-1-ip>` does NOT work from the laptop because the NVIDIA Sync ssh_config only has a Host entry for `<spark-1-host>.local`. Always use the `.local` hostname or `<spark-2-ip>`-style entries that ARE matched.
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## Older models in `models.yaml`
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The `qwen3-235b-fp8` and `qwen25-72b` catalog entries are conservative guesses for vLLM flags — they're on disk but were never the focus of this project. First launch of either may fail or be suboptimal; capture working flags here.
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