Recently I bought a new switch has 2 10G SFP+ ports and 4 2.5G ports, connect my laptop and Unraid NAS both with 2.5G ports, the speed in normal, can transfer files at 280mb/s.

 

Today I upgrade my NAS with a X520 DA2 card, connect to one of SPF+ port the switch, find out the speed is very slow, downloading files from NAS to my laptop around 40 to 80mb/s, and I can't even upload file from my laptop to the NAS, it just stuck.

 

The NIC interface shows nothing wrong with the card:

 

Running iperf shows extreme low speed:

PC to NAS

NAS to PC:

 

Since this the 1st time I try 10Gb network and SFP+ card and cables, I wonder somewhere I must mess up big time.

Edited June 22, 20233 yr by xyzeratul

after a reboot and reinstall the card and SFP cable, the NAS to PC speed still stuck around 100mb/s, and PC to NAS speed stuck at 10mb to 30mb/s.

 

I am a bit lost, any idea where I should start to look for the problem?

This is usually NIC, SFP+ module, cable or switch related.

42 minutes ago, JorgeB said:

This is usually NIC, SFP+ module, cable or switch related.

I know the NIC is probably OK, the swich is brand new.

 

So maybe the cable or SFP+ module? I ordered a different brand this time, will update after I get it.

Edited June 22, 20233 yr by xyzeratul

Changed a new cable, now the upload speed is better but still only like 120mb/s