The data management inside a Ceph cluster involves all the components that we have discussed so far. The coordination between these components gives power to Ceph to provide a reliable and robust storage system. Data management starts as soon as a client writes data to a Ceph pool. Once the client writes data to a Ceph pool, data is first written to a primary OSD based on the pool replication size. The primary OSD replicates the same data to its secondary and tertiary OSDs and waits for their acknowledgement. As soon as the secondary and tertiary OSDs complete data writing, they send an acknowledgement signal to the primary OSD, and finally, the primary OSD returns an acknowledgement to the client confirming the write operation completion.

In this way, Ceph consistently stores each client write operation and provides data availability from its replicas in the event of failures. Let's now see how data is stored in a Ceph cluster: