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Unfortunately it didn't help at all , for some reason during any major operation like disk move , clone or restore , its the same story , very high load that appears to be too many theards of process that are opening and causing major IO delay on the system .. anything else that you can suggest...

Hi, Thanks a lot for the help , though how can i do it ? do i change it using the command "zfs set checksum..." ? can the change you are suggesting be done on a live production ZFS volume? Thanks so much.

Latest on all servers , minimal version on our cluster is 6.1-3 Proxmox-ve: 6.1-2 (running kernel: 5.3.13-1-pve) pve-manager: 6.1-5 (running version: 6.1-5/9bf06119) pve-kernel-5.3: 6.1-1 pve-kernel-helper: 6.1-1 pve-kernel-5.0: 6.0-11 pve-kernel-5.3.13-1-pve: 5.3.13-1 pve-kernel-5.0.21-5-pve...

Hi We have a setup of ZFS over ISCSI using LIO on Ubuntu 18 , and we have an issue with high IO load once we move disks that are bigger than 100GB, once the move starts the Load is low until about a half of the transfer is done, and then it's getting crazy high, our setup is very high end ...