Slow performance is defined as when the cluster is actively processing I/O requests, but it appears to be operating at a lower performance level than what is expected. Generally, slow performance is caused by a component of your Ceph cluster reaching saturation and becoming a bottleneck. This maybe due to an increased number of client requests or a component failure that is causing Ceph to perform recovery.
Slow performance
Causes
Although there are many things that may cause Ceph to experience slow performance, here are some of the most likely causes.
