[ceph-users] Questions about rbd flatten command

Hello, I executed multiple 'rbd flatten' commands simultaneously on a client. The elapsed time of each flatten job increased as the number of jobs increased, and network I/O was nearly full. so, I have two questions. 1. isn’t the flatten job running within the ceph cluster? Why is client-side network I/O so high? 2. How can I apply qos for each flatten job to reduce network I/O? Sincerely,