You can experience one of the following issues during a large (4000 users and more) test:
- Missing session data in your SQL server.
- Sessions are not launched anymore, the LoadGen Director seems to not instruct LoadGen Agents to start new sessions.
- The LoadGen Director is not responding anymore.
If you experience one of the following issues make sure you move the LoadGen Director software to a dedicated machine or a machine with faster CPUs installed.