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I have two 10Gb adapters in a Team, so for the 20Gb Team:
SMB Multi-Channel Not working
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reuvygroovy
781
Reputation points
I have two Windows 2019 Servers. Each server has a 2 x 10Gb Team of adapters grouped together as a single interface. I am transferring a bunch of large ISO files (each between 5-20GB) at the same time from one to the other.
I have checked on the both servers and both command on each return True:
Get-SmbClientConfiguration | Select EnableMultichannel
Get-SmbServerConfiguration | Select EnableMultichannel
But when I copy the above mentioned files from one host to another, when running the command Get-SmbMultichannelConnection I don't see any connections (IPs) from any of these servers (on both servers). I also don't think I am using both adapters since my throughput (which theoretically should be 20Gb usually caps at about 500-600MB/s.
Windows for business | Windows Server | User experience | Other
Accepted answer
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reuvygroovy 781 Reputation points
2021-04-14T09:05:04.39+00:00 -
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Anonymous2021-04-14T09:09:43.077+00:00 You might temporarily disable firewall on both side on then check whether SMB Multi-Channel works.
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4 additional answers
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Anonymous
2021-04-14T09:01:37.13+00:00 Hi,
Please first make sure the binding for the NIC is set to true for SMB client (MS_client) and SMB server (MS_server).
The command below should show True under Enabled for both:
Get-NetAdapterBinding -ComponentID ms_server,ms_msclientAfter that, make sure the network interface is listed in the output of the following commands:
Get-SmbServerNetworkInterfaceGet-SmbClientNetworkInterfaceIf everything looks good there, check the firewall. Make sure SMB traffic is not blocked by firewall. If the network profile is set to Public. This means that SMB is blocked at the firewall by default.
The following article talks about how to troubleshoot SMB Multichannel issue, you could have a look: SMB Multichannel troubleshooting
Best Regards,
Candy
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reuvygroovy 781 Reputation points
2021-04-14T09:21:09.537+00:00 No firewall. This is on a LAN.
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Anonymous
2021-04-14T09:24:13+00:00 Have you checked windows firewall?
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reuvygroovy 781 Reputation points
2021-04-14T09:25:18.093+00:00 Yes, Allow Any-Any
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Anonymous
2021-04-14T09:27:20.883+00:00 Temporally disable windows firewall on both sides to do a test. If it still doesn't work, you need to trace network traffic to find the cause.
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reuvygroovy 781 Reputation points
2021-04-14T09:28:29.12+00:00 What would I be looking for in a traffic trace?
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Anonymous
2021-04-14T09:30:09.18+00:00 Look for the NETWORK_INTERFACE_INFO packets. You can refer to the following article: Capture client and server sided traffic for troubleshooting
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reuvygroovy 781 Reputation points
2021-04-21T04:44:05.85+00:00 Working on it. Hope to update soon.