> > client doesn't know global metadata load. how does it avoid throttling > while global load is relatively low? > In our scenario, the number of metadata ios issued by clients is relatively low. But there exists some bursty workloads on a small number of clients. So, we think maybe we can implement a client throttler like that in RBD(https://github.com/ceph/ceph/pull/17032), and set to threshold to a value relative higher than the throughput needed most of the time, which would cause problem in ordinary cases and prevent those bursty clients use up cluster resources. Is this feasible? And, by the way, do you think dmclock can also be used for file system metadata io qos? Thanks:-)
