SMB2 copy issue and SRT
I am having an issue, copying a single large file (2GB) from a Server 2016 to a Windows 10 client. Both client and server on same network and subnet
2 laptops (different models), on one of the laptops copy takes about 5 mins as expected. One another laptop copy takes about 30 mins and in Windwos copy GUi I can see the transfer rate drop to 0 bytes per second and then increase
I took wireshark trace from both laptops and I am suspecting issue with the SMB2.
I did a SMB2 SRT analysis on the 2 laptops and on the laptop with slow copy the READ SRT sum value is very high, compared to the same read on the laptop with the good copy
Am I correct in thinking the issue is related to SMB on the client side
It is propably a combination of factors. But a client which downgrades a connection type will have a dramatic adverse effect on the performance. But without actually looking at the packet capture it is very hard to tell. But in your case I would lok at the details at the start of the session. Nuances in the negotiation may decrease effentiency a lot.
I did further testing can confirm issue is with SMB2
I copied same file from same server to same client using FTP and 2 Gb file took 7 minutes to copy
Same copy using SMB2 takes 30 mins.