Rackdiag

```kroki {_type=rackdiag}

rackdiag {
  // define 1st rack
  rack {
    16U;

    // define rack items
    1: UPS [2U];
    3: DB Server
    4: Web Server
    5: Web Server 
    6: Web Server
    7: Load Balancer
    8: L3 Switch
    9: N/A [8U];
  }

  // define 2nd rack
  rack {
    12U;

    // define rack items
    1: UPS [2U];
    3: DB Server
    4: Web Server
    5: Web Server
    6: Web Server
    7: Load Balancer
    8: L3 Switch
  }
}
```