In this chapter, we have covered the theory behind Cephs RADOS tiering functionality and looked at the configuration and tuning operations available to best make it work for your workload. It should not be forgotten that the most important aspect is to understand your workload and be confident that its I/O pattern and distribution is cache friendly. By following the examples in this chapter, you should also now understand the required steps to implement tiered pools and how to apply the configuration options.