Backup speed XO vs command line

lukask

Hello All,

My server:
4xCPU XEON E7-4820 @2GHz, 1CPU 8CORE/16Threads
64GB RAM
8x HDD 300GB 10k RAID 50
Network Intel X520 - 2x10Gbit
Control domain memory 4.2GiB
XCP-NG version 8.2 LTS latest update

Storage QNAP
4x10TB HDD - RAID5
2x10Gbit network interface

XCP-NG - 10Gbit interface connected
Storage QNAP - 10Gbit interface connected
XO VM is installed on XCP-NG on same interface 10Gbit

All devices are connected on same network and data flows only through 10Gbit interface.
Iperf test on QNAP Storage from XCP-NG and XO VM is 10Gbit - max. speed

I have tried export and import VM and VDI from command line and XO from source:

Export VM 8GB DISK from XO to NFS - 50MB/s
Export VM 8GB DISK from command line to NFS - 110MB/s

Import VM from NFS to local storage on XCP-NG through XO - 50MB/s
Import VM from NFS to local storage on XCP-NG through command line - 150MB/s

Export VDI to NFS through command line - 230MB/s
Import VDI to XCP-NG through command line - 220MB/s

I have tried setup XO on HTTP same speed of backup.

Could you tell me your back speed from XO or command line to external storage?
Why backup speed through XO is so slower than through command line or backup speed is normal?

Thank you for your reply