When Ceph performs deep scrubbing to check your data for any inconsistencies, it has to read all the objects from the OSD; this can be a very IO-intensive task, and on large drives, the process can take a long time. Scrubbing is vital to protect against data loss and therefore should not be disabled. Various tuning options were discussed in Chapter 9, Tuning Ceph regarding setting windows for scrubbing and its priority. By tweaking these settings, a lot of the performance impact on client workloads from scrubbing can be avoided.