1. That rack was the first to run the OpenStack software.

2. This is usually more convenient than removing the entire third rack, which you can also do.

3. You can slide sections of the third rack out of the way to load tall items underneath.

4. The upper rack has three height options, allowing you to fit tall items.

5. The portfolio includes highly configurable models of rack and tower servers.

6. The upper rack cannot be adjusted.