# GPU Lab Runbook — VM303 (atc-gpu-dev)

See also `config/gpu-lab/RUNBOOK.md` (synced from VM303).

## Activate via UI

GPU Lab → select model → **Activate**. Writes `/root/gpu-lab/active/current.env`, stops other gpu-lab containers, starts matching compose stack.

## Manual activate (SGLang + Qwen 3.6 27B AWQ)

```bash
cd /root/gpu-lab
cat > active/current.env << 'EOF'
MODEL_PATH=/models/qwen36-27b-awq
SERVED_NAME=qwen3.6-27b-awq
TP_SIZE=4
GPU_MEM_UTIL=0.9
MAX_MODEL_LEN=8192
EOF
docker compose -f compose.vllm-legacy.yml down
docker compose -f compose.vllm-modern.yml down
docker compose -f compose.sglang.yml up -d
curl -s http://127.0.0.1:8010/v1/models
systemctl restart vllm-gateway.service
```

## Rollback to systemd vLLM

```bash
cd /root/gpu-lab
docker compose -f compose.vllm-legacy.yml down
docker compose -f compose.vllm-modern.yml down
docker compose -f compose.sglang.yml down
systemctl start vllm.service
systemctl restart vllm-gateway.service litellm-proxy.service
```

## Logs

```bash
docker logs -f gpu-lab-sglang
journalctl -u model-manager -f
```

## SGLang on V100

Always use `--disable-flashinfer` and `--disable-flashinfer-sampling` (in `compose.sglang.yml`).