[ci]use H20 to run disaggregation test (#11543)

.github/workflows/pr-test.yml

@@ -350,6 +350,39 @@ jobs:
           cd test/srt
           python3 run_suite.py --suite per-commit-8-gpu --auto-partition-id ${{ matrix.part }} --auto-partition-size 2
 
+  unit-test-backend-8-gpu-h20:
+    needs: [check-changes, unit-test-backend-2-gpu, sgl-kernel-build-wheels]
+    if: always() && !failure() && !cancelled() &&
+        ((needs.check-changes.outputs.main_package == 'true') || (needs.check-changes.outputs.sgl_kernel == 'true'))
+    runs-on: 8-gpu-h20
+    env:
+      SGLANG_CI_RDMA_ALL_DEVICES: "mlx5_1,mlx5_2,mlx5_3,mlx5_4"
+    strategy:
+      fail-fast: false
+      matrix:
+        part: [0, 1]
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Download artifacts
+        if: needs.check-changes.outputs.sgl_kernel == 'true'
+        uses: actions/download-artifact@v4
+        with:
+          path: sgl-kernel/dist/
+          merge-multiple: true
+          pattern: wheel-python3.10-cuda12.9
+
+      - name: Install dependencies
+        run: |
+          CUSTOM_BUILD_SGL_KERNEL=${{needs.check-changes.outputs.sgl_kernel}} bash scripts/ci/ci_install_dependency.sh
+
+      - name: Run test
+        timeout-minutes: 20
+        run: |
+          cd test/srt
+          python3 run_suite.py --suite per-commit-8-gpu-h20 --auto-partition-id ${{ matrix.part }} --auto-partition-size 2
+
   performance-test-1-gpu-part-1:
     needs: [check-changes, sgl-kernel-build-wheels]
     if: always() && !failure() && !cancelled() &&