The performance of any system is quantified by load and performance testing. The results of these tests help us to make the decision whether the current setup requires tuning or not. Performance tuning is the process of rectifying performance bottlenecks identified during performance tests. Performance tuning is a very vast topic, which requires a deep study of each and every component, whether it's internal or external to Ceph.

The recommended approach to fine-tune a Ceph cluster is to start investigation from one end of the cluster's smallest element up to the level of end users who use the storage services. In this section, we will cover some performance tuning parameters from a Ceph cluster's point of view. We will define these performance tuning parameters under a Ceph cluster configuration file so that each time any Ceph daemon starts, it should adhere to the tuning setting. We will first learn about Ceph configuration files and its various sections...