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1/3 speed over SSH/cifs mount to Unraid server


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I have search this forum but nothing I read seems to explain what the reason for the "slow" transfers

 

We have a unraid server running 6.10.3 with 3GBytes/s SSD RAID. The network speeds is 10Gbps but when we transfer a 0.5TB file it hovers at 150MiB/s 

 

Iperf3 shows that between the unraid server and the Ubuntu 20.04 client system there is  4.33 Gbits/sec.

 

if I use DD to test its dopers down to 150MiB/s. Its the same if I copy a file.

 

have tired ssh and mounting a folder with cifs on the client server and it just copies to that folder.

 

both system have fast AMD epyc CPU's with 500GB ram.  Both the unraid nas and the client system has RAID SSD's. tested +2893 MB/s

 

I have no idea why we are seeing a 1/3 what we would expect

any suggestions? 

Edited by Etherion
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