Windows SMB Multichannel, 1 way multichannel speed.

Napsterbater 1 Reputation point
2020-09-09T00:36:39.457+00:00

I have a Windows 2019 1809 file server and a Windows 10 2004, and this has persisted over multiple versions on both.

I have tried a ton of things trying to get this sorted.

I have consistently been able to get >1gbps when on the Windows 10 and pulling files from the server, I can see the transfer using multiple NICs and roughly evenly spread across all NICs on both sides.

However when sending files to the server from the Windows 10 client I can see the transfer only using 1 NIC on the Client side, yet an even spread on the server. So there are multiple connections to the server, they are just being sourced from 1 of the 4 NICs on the Client.

I have tried with RSS enabled and disabled on both sides, at one point I had a LACP on the server (unable on the client). no matter what the results are the same, >1gbps from Server -> Client and <1gbps from Client to Server.

Anyone have any ideas?

Windows Server 2019
Windows Server 2019
A Microsoft server operating system that supports enterprise-level management updated to data storage.
3,470 questions
Windows 10 Network
Windows 10 Network
Windows 10: A Microsoft operating system that runs on personal computers and tablets.Network: A group of devices that communicate either wirelessly or via a physical connection.
2,275 questions

4 answers

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  1. Gloria Gu 3,891 Reputation points
    2020-09-09T03:08:52.517+00:00

    Hi,

    During SMB Multichannel, if the NICs are RSS-capable, SMB Multichannel establishes a maximum of four network connections over each NIC. If the NICs on the client are not RSS-capable, SMB Multichannel establishes a single network connection over each NIC. Both configurations allow SMB Multichannel to leverage the combined bandwidth of multiple NICs and provides connection fault tolerance if a connection or a NIC fails.

    In regards to your issue, the server-client connection work successfully. So the problem is with the client configuration.

    On the SMB client, while the copy operation is running, type the following in Windows PowerShell to verify that the connection uses the right version of SMB and that SMB Multichannel works. Please provide with the screenshots of the commands, it will be of great importance for trouble-shooting:

    Get-SmbConnection
    Get-SmbMultichannelConnection
    Get-SmbMultichannelConnection -IncludeNotSelected

    ============================================

    If the Answer is helpful, please click "Accept Answer" and upvote it.
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  2. Napsterbater 1 Reputation point
    2020-09-09T21:22:50.8+00:00

    As I noted, when uploading from the Client to the Server the Client shows a single NIC with load about 1gbps outbound but the server shows 4 NICS (actually 5 now) with an approximate even spread of load, which means the client is using 4-5 connections (or more), just for some reason it is only sourcing all of them from 1 NIC.

    Below you can see currently the client has 4 NICS, the server has 5 now, you can see it is reporting 5 Multichannel Connections, yet only are transfers from server to client spread over all NICS on both sides. 

    PS C:\WINDOWS\system32> Get-SmbConnection

ServerName                ShareName    UserName              Credential                  Dialect NumOpens
----------                ---------    --------              ----------                  ------- --------
fileserver.mydomain.local Backup       mydomain\****         mydomain.LOCAL\****         3.1.1   1
fileserver.mydomain.local Backup       mydomain\Napsterbater mydomain.LOCAL\Napsterbater 3.1.1   3
fileserver.mydomain.local E-RAW        mydomain\Napsterbater mydomain.LOCAL\Napsterbater 3.1.1   1
fileserver.mydomain.local Misc         mydomain\****         mydomain.LOCAL\****         3.1.1   1
fileserver.mydomain.local Misc         mydomain\Napsterbater mydomain.LOCAL\Napsterbater 3.1.1   3
fileserver.mydomain.local MovieTVvideo mydomain\****         mydomain.LOCAL\****         3.1.1   1
fileserver.mydomain.local MovieTVvideo mydomain\Napsterbater mydomain.LOCAL\Napsterbater 3.1.1   1
fileserver.mydomain.local Y-RAW        mydomain\Napsterbater mydomain.LOCAL\Napsterbater 3.1.1   6


PS C:\WINDOWS\system32> Get-SmbMultichannelConnection

Server Name               Selected Client IP                           Server IP                            Client Interface Index Server Interface Index Client RSS Capable Client RDMA Capable
-----------               -------- ---------                           ---------                            ---------------------- ---------------------- ------------------ -------------------
fileserver.mydomain.local True     2001:470:xxxx:1:f88a:5a9d:ad3e:2719 2001:470:xxxx:1::160                 20                     20                     False              False
fileserver.mydomain.local True     2001:470:xxxx:1:9044:f958:ceea:38eb 2001:470:xxxx:1:4038:58f4:b600:911d  10                     10                     False              False
fileserver.mydomain.local True     2001:470:xxxx:1:e015:d656:df8:cc26  fda9:26a9:1c47:1:4de1:3ba4:ff38:eb28 2                      18                     False              False
fileserver.mydomain.local True     2001:470:xxxx:1:3ce1:b805:f212:bd73 2001:470:xxxx:1:5c28:9c44:8f70:16d9  13                     15                     False              False
fileserver.mydomain.local True     2001:470:xxxx:1:b8c3:794b:32bf:d7fe fda9:26a9:1c47:1:487f:b7f4:37eb:9002 10                     8                      False              False


PS C:\WINDOWS\system32> Get-SmbMultichannelConnection -IncludeNotSelected

Server Name               Selected Client IP                            Server IP                            Client Interface Index Server Interface Index Client RSS Capable Client RDMA Capable
-----------               -------- ---------                            ---------                            ---------------------- ---------------------- ------------------ -------------------
fileserver.mydomain.local False    2001:470:xxxx:1:3ce1:b805:f212:bd73  2001:470:xxxx:1::199                 13                     20                     False              False
fileserver.mydomain.local False    2001:470:xxxx:1:dcf6:506c:92c3:44f8  2001:470:xxxx:1:8581:c700:1790:61e9  13                     20                     False              False
fileserver.mydomain.local True     2001:470:xxxx:1:f88a:5a9d:ad3e:2719  2001:470:xxxx:1::160                 20                     20                     False              False
fileserver.mydomain.local False    2001:470:xxxx:1:e015:d656:df8:cc26   2001:470:xxxx:1::33                  2                      20                     False              False
fileserver.mydomain.local False    2001:470:xxxx:1:9044:f958:ceea:38eb  2001:470:xxxx:1::32                  10                     20                     False              False
fileserver.mydomain.local False    2001:470:xxxx:1:b8c3:794b:32bf:d7fe  2001:470:xxxx:1::31                  10                     20                     False              False
fileserver.mydomain.local False    2001:470:xxxx:1:1595:ee92:49ed:faca  2001:470:xxxx:1::30                  2                      20                     False              False
fileserver.mydomain.local False    2001:470:xxxx:1:4014:a2e0:b21d:b9d7  2001:470:xxxx:1::7                   20                     20                     False              False
fileserver.mydomain.local False    fda9:26a9:1c47:1:3ce1:b805:f212:bd73 fda9:26a9:1c47:1::199                13                     20                     False              False
fileserver.mydomain.local False    fda9:26a9:1c47:1:dcf6:506c:92c3:44f8 fda9:26a9:1c47:1:8581:c700:1790:61e9 13                     20                     False              False
fileserver.mydomain.local False    fda9:26a9:1c47:1:e015:d656:df8:cc26  fda9:26a9:1c47:1::160                2                      20                     False              False
fileserver.mydomain.local False    fda9:26a9:1c47:1:f88a:5a9d:ad3e:2719 fda9:26a9:1c47:1::33                 20                     20                     False              False
fileserver.mydomain.local False    fda9:26a9:1c47:1:9044:f958:ceea:38eb fda9:26a9:1c47:1::32                 10                     20                     False              False
fileserver.mydomain.local False    fda9:26a9:1c47:1:b8c3:794b:32bf:d7fe fda9:26a9:1c47:1::31                 10                     20                     False              False
fileserver.mydomain.local False    fda9:26a9:1c47:1:4014:a2e0:b21d:b9d7 fda9:26a9:1c47:1::30                 20                     20                     False              False
fileserver.mydomain.local False    fda9:26a9:1c47:1:1595:ee92:49ed:faca fda9:26a9:1c47:1::7                  2                      20                     False              False
fileserver.mydomain.local False    10.0.1.47                            10.0.1.199                           2                      20                     False              False
fileserver.mydomain.local False    2001:0:34a2:52f8:28b1:47a9:e7ce:bc87 2001:470:xxxx:1::5                   11                     20                     False              False
fileserver.mydomain.local False    fe80::dcf6:506c:92c3:44f8            2001:470:xxxx:1:5c28:9c44:8f70:16d9  13                     15                     False              False
fileserver.mydomain.local False    2001:470:xxxx:1:3ce1:b805:f212:bd73  2001:470:xxxx:1:487f:b7f4:37eb:9002  13                     8                      False              False
fileserver.mydomain.local False    2001:470:xxxx:1:dcf6:506c:92c3:44f8  2001:470:xxxx:1:4de1:3ba4:ff38:eb28  13                     18                     False              False
fileserver.mydomain.local True     2001:470:xxxx:1:9044:f958:ceea:38eb  2001:470:xxxx:1:4038:58f4:b600:911d  10                     10                     False              False
fileserver.mydomain.local False    fda9:26a9:1c47:1:3ce1:b805:f212:bd73 fda9:26a9:1c47:1::5                  13                     20                     False              False
fileserver.mydomain.local False    fda9:26a9:1c47:1:dcf6:506c:92c3:44f8 fda9:26a9:1c47:1:5c28:9c44:8f70:16d9 13                     15                     False              False
fileserver.mydomain.local False    fda9:26a9:1c47:1:f88a:5a9d:ad3e:2719 fda9:26a9:1c47:1:487f:b7f4:37eb:9002 20                     8                      False              False
fileserver.mydomain.local False    fda9:26a9:1c47:1:9044:f958:ceea:38eb fda9:26a9:1c47:1:4de1:3ba4:ff38:eb28 10                     18                     False              False
fileserver.mydomain.local False    fda9:26a9:1c47:1:e015:d656:df8:cc26  fda9:26a9:1c47:1:4038:58f4:b600:911d 2                      10                     False              False
fileserver.mydomain.local False    10.0.1.47                            10.0.1.160                           2                      20                     False              False
fileserver.mydomain.local False    fe80::28b1:47a9:e7ce:bc87            2001:470:xxxx:1:8581:c700:1790:61e9  11                     20                     False              False
fileserver.mydomain.local False    fe80::1595:ee92:49ed:faca            2001:470:xxxx:1::199                 2                      20                     False              False
fileserver.mydomain.local False    fe80::b8c3:794b:32bf:d7fe            2001:470:xxxx:1::160                 10                     20                     False              False
fileserver.mydomain.local False    fe80::4014:a2e0:b21d:b9d7            2001:470:xxxx:1::33                  20                     20                     False              False
fileserver.mydomain.local False    2001:470:xxxx:1:e015:d656:df8:cc26   2001:470:xxxx:1::32                  2                      20                     False              False
fileserver.mydomain.local False    2001:470:xxxx:1:f88a:5a9d:ad3e:2719  2001:470:xxxx:1::31                  20                     20                     False              False
fileserver.mydomain.local False    2001:470:xxxx:1:b8c3:794b:32bf:d7fe  2001:470:xxxx:1::30                  10                     20                     False              False
fileserver.mydomain.local False    2001:470:xxxx:1:1595:ee92:49ed:faca  2001:470:xxxx:1::7                   2                      20                     False              False
fileserver.mydomain.local False    2001:470:xxxx:1:4014:a2e0:b21d:b9d7  2001:470:xxxx:1::5                   20                     20                     False              False
fileserver.mydomain.local False    fda9:26a9:1c47:1:4014:a2e0:b21d:b9d7 fda9:26a9:1c47:1:8581:c700:1790:61e9 20                     20                     False              False
fileserver.mydomain.local False    fda9:26a9:1c47:1:1595:ee92:49ed:faca fda9:26a9:1c47:1::199                2                      20                     False              False
fileserver.mydomain.local False    fda9:26a9:1c47:1:b8c3:794b:32bf:d7fe fda9:26a9:1c47:1::160                10                     20                     False              False
fileserver.mydomain.local False    10.0.1.47                            10.0.1.33                            2                      20                     False              False
fileserver.mydomain.local False    2001:0:34a2:52f8:28b1:47a9:e7ce:bc87 2001:470:xxxx:1:5c28:9c44:8f70:16d9  11                     15                     False              False
fileserver.mydomain.local False    fe80::dcf6:506c:92c3:44f8            2001:470:xxxx:1:487f:b7f4:37eb:9002  13                     8                      False              False
fileserver.mydomain.local False    2001:470:xxxx:1:3ce1:b805:f212:bd73  2001:470:xxxx:1:4de1:3ba4:ff38:eb28  13                     18                     False              False
fileserver.mydomain.local False    2001:470:xxxx:1:dcf6:506c:92c3:44f8  2001:470:xxxx:1:4038:58f4:b600:911d  13                     10                     False              False
fileserver.mydomain.local False    fda9:26a9:1c47:1:3ce1:b805:f212:bd73 fda9:26a9:1c47:1::33                 13                     20                     False              False
fileserver.mydomain.local False    fda9:26a9:1c47:1:dcf6:506c:92c3:44f8 fda9:26a9:1c47:1::32                 13                     20                     False              False
fileserver.mydomain.local False    fda9:26a9:1c47:1:e015:d656:df8:cc26  fda9:26a9:1c47:1::31                 2                      20                     False              False
fileserver.mydomain.local False    fda9:26a9:1c47:1:9044:f958:ceea:38eb fda9:26a9:1c47:1::30                 10                     20                     False              False
fileserver.mydomain.local False    fda9:26a9:1c47:1:f88a:5a9d:ad3e:2719 fda9:26a9:1c47:1::7                  20                     20                     False              False
fileserver.mydomain.local False    fda9:26a9:1c47:1:1595:ee92:49ed:faca fda9:26a9:1c47:1::5                  2                      20                     False              False
fileserver.mydomain.local False    fda9:26a9:1c47:1:b8c3:794b:32bf:d7fe fda9:26a9:1c47:1:5c28:9c44:8f70:16d9 10                     15                     False              False
fileserver.mydomain.local False    fda9:26a9:1c47:1:4014:a2e0:b21d:b9d7 fda9:26a9:1c47:1:487f:b7f4:37eb:9002 20                     8                      False              False
fileserver.mydomain.local False    10.0.1.47                            10.0.1.32                            2                      20                     False              False
fileserver.mydomain.local True     2001:470:xxxx:1:e015:d656:df8:cc26   fda9:26a9:1c47:1:4de1:3ba4:ff38:eb28 2                      18                     False              False
fileserver.mydomain.local False    2001:470:xxxx:1:9044:f958:ceea:38eb  fda9:26a9:1c47:1:4038:58f4:b600:911d 10                     10                     False              False
fileserver.mydomain.local False    fe80::b8c3:794b:32bf:d7fe            2001:470:xxxx:1:8581:c700:1790:61e9  10                     20                     False              False
fileserver.mydomain.local False    fe80::28b1:47a9:e7ce:bc87            2001:470:xxxx:1::199                 11                     20                     False              False
fileserver.mydomain.local False    fe80::1595:ee92:49ed:faca            2001:470:xxxx:1::160                 2                      20                     False              False
fileserver.mydomain.local False    fe80::4014:a2e0:b21d:b9d7            2001:470:xxxx:1::32                  20                     20                     False              False
fileserver.mydomain.local False    2001:470:xxxx:1:f88a:5a9d:ad3e:2719  2001:470:xxxx:1::33                  20                     20                     False              False
fileserver.mydomain.local False    2001:470:xxxx:1:4014:a2e0:b21d:b9d7  2001:470:xxxx:1::31                  20                     20                     False              False
fileserver.mydomain.local False    2001:470:xxxx:1:b8c3:794b:32bf:d7fe  2001:470:xxxx:1::7                   10                     20                     False              False
fileserver.mydomain.local False    2001:470:xxxx:1:1595:ee92:49ed:faca  2001:470:xxxx:1::5                   2                      20                     False              False
fileserver.mydomain.local False    10.0.1.47                            10.0.1.31                            2                      20                     False              False
fileserver.mydomain.local False    2001:0:34a2:52f8:28b1:47a9:e7ce:bc87 2001:470:xxxx:1::30                  11                     20                     False              False
fileserver.mydomain.local False    fe80::dcf6:506c:92c3:44f8            2001:470:xxxx:1:4de1:3ba4:ff38:eb28  13                     18                     False              False
fileserver.mydomain.local True     2001:470:xxxx:1:3ce1:b805:f212:bd73  2001:470:xxxx:1:5c28:9c44:8f70:16d9  13                     15                     False              False
fileserver.mydomain.local False    2001:470:xxxx:1:dcf6:506c:92c3:44f8  2001:470:xxxx:1:487f:b7f4:37eb:9002  13                     8                      False              False
fileserver.mydomain.local False    2001:470:xxxx:1:e015:d656:df8:cc26   2001:470:xxxx:1:4038:58f4:b600:911d  2                      10                     False              False
fileserver.mydomain.local False    fda9:26a9:1c47:1:3ce1:b805:f212:bd73 fda9:26a9:1c47:1::160                13                     20                     False              False
fileserver.mydomain.local False    fda9:26a9:1c47:1:dcf6:506c:92c3:44f8 fda9:26a9:1c47:1::199                13                     20                     False              False
fileserver.mydomain.local False    fda9:26a9:1c47:1:9044:f958:ceea:38eb fda9:26a9:1c47:1:8581:c700:1790:61e9 10                     20                     False              False
fileserver.mydomain.local False    fda9:26a9:1c47:1:e015:d656:df8:cc26  fda9:26a9:1c47:1::33                 2                      20                     False              False
fileserver.mydomain.local False    fda9:26a9:1c47:1:f88a:5a9d:ad3e:2719 fda9:26a9:1c47:1::32                 20                     20                     False              False
fileserver.mydomain.local False    fda9:26a9:1c47:1:1595:ee92:49ed:faca fda9:26a9:1c47:1::31                 2                      20                     False              False
fileserver.mydomain.local False    fda9:26a9:1c47:1:b8c3:794b:32bf:d7fe fda9:26a9:1c47:1::30                 10                     20                     False              False
fileserver.mydomain.local False    fda9:26a9:1c47:1:4014:a2e0:b21d:b9d7 fda9:26a9:1c47:1::7                  20                     20                     False              False
fileserver.mydomain.local False    10.0.1.47                            10.0.1.30                            2                      20                     False              False
fileserver.mydomain.local False    2001:470:xxxx:1:9044:f958:ceea:38eb  fda9:26a9:1c47:1::5                  10                     20                     False              False
fileserver.mydomain.local False    2001:470:xxxx:1:f88a:5a9d:ad3e:2719  fda9:26a9:1c47:1:5c28:9c44:8f70:16d9 20                     15                     False              False
fileserver.mydomain.local True     2001:470:xxxx:1:b8c3:794b:32bf:d7fe  fda9:26a9:1c47:1:487f:b7f4:37eb:9002 10                     8                      False              False
fileserver.mydomain.local False    2001:0:34a2:52f8:28b1:47a9:e7ce:bc87 fda9:26a9:1c47:1:4de1:3ba4:ff38:eb28 11                     18                     False              False
fileserver.mydomain.local False    2001:470:xxxx:1:4014:a2e0:b21d:b9d7  fda9:26a9:1c47:1:4038:58f4:b600:911d 20                     10                     False              False
fileserver.mydomain.local False    fe80::1595:ee92:49ed:faca            2001:470:xxxx:1:8581:c700:1790:61e9  2                      20                     False              False
fileserver.mydomain.local False    fe80::4014:a2e0:b21d:b9d7            2001:470:xxxx:1::199                 20                     20                     False              False
fileserver.mydomain.local False    fe80::28b1:47a9:e7ce:bc87            2001:470:xxxx:1::160                 11                     20                     False              False
fileserver.mydomain.local False    fe80::b8c3:794b:32bf:d7fe            2001:470:xxxx:1::33                  10                     20                     False              False
fileserver.mydomain.local False    2001:470:xxxx:1:1595:ee92:49ed:faca  2001:470:xxxx:1::32                  2                      20                     False              False
fileserver.mydomain.local False    10.0.1.47                            10.0.1.7                             2                      20                     False              False
fileserver.mydomain.local False    fe80::dcf6:506c:92c3:44f8            2001:470:xxxx:1::31                  13                     20                     False              False
fileserver.mydomain.local False    fe80::28b1:47a9:e7ce:bc87            2001:470:xxxx:1::30                  11                     20                     False              False
fileserver.mydomain.local False    fe80::b8c3:794b:32bf:d7fe            2001:470:xxxx:1::7                   10                     20                     False              False
fileserver.mydomain.local False    fe80::4014:a2e0:b21d:b9d7            2001:470:xxxx:1::5                   20                     20                     False              False
fileserver.mydomain.local False    2001:470:xxxx:1:3ce1:b805:f212:bd73  2001:470:xxxx:1:4038:58f4:b600:911d  13                     10                     False              False
fileserver.mydomain.local False    2001:470:xxxx:1:dcf6:506c:92c3:44f8  2001:470:xxxx:1:5c28:9c44:8f70:16d9  13                     15                     False              False
fileserver.mydomain.local False    2001:470:xxxx:1:f88a:5a9d:ad3e:2719  2001:470:xxxx:1:487f:b7f4:37eb:9002  20                     8                      False              False
fileserver.mydomain.local False    2001:470:xxxx:1:9044:f958:ceea:38eb  2001:470:xxxx:1:4de1:3ba4:ff38:eb28  10                     18                     False              False
fileserver.mydomain.local False    fda9:26a9:1c47:1:3ce1:b805:f212:bd73 fda9:26a9:1c47:1::32                 13                     20                     False              False
fileserver.mydomain.local False    fda9:26a9:1c47:1:dcf6:506c:92c3:44f8 fda9:26a9:1c47:1::160                13                     20                     False              False
fileserver.mydomain.local False    fda9:26a9:1c47:1:e015:d656:df8:cc26  fda9:26a9:1c47:1:8581:c700:1790:61e9 2                      20                     False              False
fileserver.mydomain.local False    fda9:26a9:1c47:1:f88a:5a9d:ad3e:2719 fda9:26a9:1c47:1::199                20                     20                     False              False
fileserver.mydomain.local False    fda9:26a9:1c47:1:9044:f958:ceea:38eb fda9:26a9:1c47:1::33                 10                     20                     False              False
fileserver.mydomain.local False    fda9:26a9:1c47:1:4014:a2e0:b21d:b9d7 fda9:26a9:1c47:1::31                 20                     20                     False              False
fileserver.mydomain.local False    fda9:26a9:1c47:1:1595:ee92:49ed:faca fda9:26a9:1c47:1::30                 2                      20                     False              False
fileserver.mydomain.local False    fda9:26a9:1c47:1:b8c3:794b:32bf:d7fe fda9:26a9:1c47:1::7                  10                     20                     False              False
fileserver.mydomain.local False    10.0.1.47                            10.0.1.5                             2                      20                     False              False
fileserver.mydomain.local False    2001:470:xxxx:1:e015:d656:df8:cc26   fda9:26a9:1c47:1::5                  2                      20                     False              False
fileserver.mydomain.local False    2001:0:34a2:52f8:28b1:47a9:e7ce:bc87 fda9:26a9:1c47:1:5c28:9c44:8f70:16d9 11                     15                     False              False
fileserver.mydomain.local False    2001:470:xxxx:1:1595:ee92:49ed:faca  fda9:26a9:1c47:1:487f:b7f4:37eb:9002 2                      8                      False              False
fileserver.mydomain.local False    2001:470:xxxx:1:b8c3:794b:32bf:d7fe  fda9:26a9:1c47:1:4de1:3ba4:ff38:eb28 10                     18                     False              False
fileserver.mydomain.local False    fe80::1595:ee92:49ed:faca            2001:470:xxxx:1::33                  2                      20                     False              False
fileserver.mydomain.local False    2001:470:xxxx:1:4014:a2e0:b21d:b9d7  2001:470:xxxx:1:8581:c700:1790:61e9  20                     20                     False              False
fileserver.mydomain.local False    fda9:26a9:1c47:1:3ce1:b805:f212:bd73 fda9:26a9:1c47:1:4038:58f4:b600:911d 13                     10                     False              False
fileserver.mydomain.local False    10.0.1.47                            10.0.1.182                           2                      15                     False              False
fileserver.mydomain.local False    fe80::dcf6:506c:92c3:44f8            2001:470:xxxx:1::199                 13                     20                     False              False
fileserver.mydomain.local False    fe80::4014:a2e0:b21d:b9d7            2001:470:xxxx:1::160                 20                     20                     False              False
fileserver.mydomain.local False    fe80::1595:ee92:49ed:faca            2001:470:xxxx:1::32                  2                      20                     False              False
fileserver.mydomain.local False    fe80::b8c3:794b:32bf:d7fe            2001:470:xxxx:1::31                  10                     20                     False              False
fileserver.mydomain.local False    fe80::28b1:47a9:e7ce:bc87            2001:470:xxxx:1::7                   11                     20                     False              False
fileserver.mydomain.local False    2001:470:xxxx:1:3ce1:b805:f212:bd73  2001:470:xxxx:1::30                  13                     20                     False              False
fileserver.mydomain.local False    2001:470:xxxx:1:dcf6:506c:92c3:44f8  2001:470:xxxx:1::5                   13                     20                     False              False
fileserver.mydomain.local False    2001:470:xxxx:1:f88a:5a9d:ad3e:2719  2001:470:xxxx:1:5c28:9c44:8f70:16d9  20                     15                     False              False
fileserver.mydomain.local False    2001:470:xxxx:1:e015:d656:df8:cc26   2001:470:xxxx:1:487f:b7f4:37eb:9002  2                      8                      False              False
fileserver.mydomain.local False    2001:470:xxxx:1:1595:ee92:49ed:faca  2001:470:xxxx:1:4de1:3ba4:ff38:eb28  2                      18                     False              False
fileserver.mydomain.local False    2001:470:xxxx:1:b8c3:794b:32bf:d7fe  2001:470:xxxx:1:4038:58f4:b600:911d  10                     10                     False              False
fileserver.mydomain.local False    fda9:26a9:1c47:1:dcf6:506c:92c3:44f8 fda9:26a9:1c47:1::33                 13                     20                     False              False
fileserver.mydomain.local False    fda9:26a9:1c47:1:f88a:5a9d:ad3e:2719 fda9:26a9:1c47:1:8581:c700:1790:61e9 20                     20                     False              False
fileserver.mydomain.local False    fda9:26a9:1c47:1:e015:d656:df8:cc26  fda9:26a9:1c47:1::199                2                      20                     False              False
fileserver.mydomain.local False    fda9:26a9:1c47:1:9044:f958:ceea:38eb fda9:26a9:1c47:1::160                10                     20                     False              False
fileserver.mydomain.local False    fda9:26a9:1c47:1:1595:ee92:49ed:faca fda9:26a9:1c47:1::32                 2                      20                     False              False
fileserver.mydomain.local False    fda9:26a9:1c47:1:4014:a2e0:b21d:b9d7 fda9:26a9:1c47:1::5                  20                     20                     False              False
fileserver.mydomain.local False    fda9:26a9:1c47:1:b8c3:794b:32bf:d7fe fda9:26a9:1c47:1:487f:b7f4:37eb:9002 10                     8                      False              False
fileserver.mydomain.local False    10.0.1.47                            10.0.1.180                           2                      8                      False              False
fileserver.mydomain.local False    2001:470:xxxx:1:9044:f958:ceea:38eb  fda9:26a9:1c47:1::31                 10                     20                     False              False
fileserver.mydomain.local False    2001:0:34a2:52f8:28b1:47a9:e7ce:bc87 fda9:26a9:1c47:1::30                 11                     20                     False              False
fileserver.mydomain.local False    2001:470:xxxx:1:4014:a2e0:b21d:b9d7  fda9:26a9:1c47:1::7                  20                     20                     False              False
fileserver.mydomain.local False    fda9:26a9:1c47:1:3ce1:b805:f212:bd73 fda9:26a9:1c47:1:5c28:9c44:8f70:16d9 13                     15                     False              False
fileserver.mydomain.local False    fda9:26a9:1c47:1:dcf6:506c:92c3:44f8 fda9:26a9:1c47:1:4de1:3ba4:ff38:eb28 13                     18                     False              False
fileserver.mydomain.local False    fda9:26a9:1c47:1:f88a:5a9d:ad3e:2719 fda9:26a9:1c47:1:4038:58f4:b600:911d 20                     10                     False              False
fileserver.mydomain.local False    10.0.1.47                            10.0.1.181                           2                      18                     False              False
fileserver.mydomain.local False    fe80::dcf6:506c:92c3:44f8            2001:470:xxxx:1:8581:c700:1790:61e9  13                     20                     False              False
fileserver.mydomain.local False    fe80::b8c3:794b:32bf:d7fe            2001:470:xxxx:1::199                 10                     20                     False              False
fileserver.mydomain.local False    fe80::28b1:47a9:e7ce:bc87            2001:470:xxxx:1::33                  11                     20                     False              False
fileserver.mydomain.local False    fe80::1595:ee92:49ed:faca            2001:470:xxxx:1::31                  2                      20                     False              False
fileserver.mydomain.local False    fe80::4014:a2e0:b21d:b9d7            2001:470:xxxx:1::30                  20                     20                     False              False
fileserver.mydomain.local False    2001:470:xxxx:1:3ce1:b805:f212:bd73  2001:470:xxxx:1::160                 13                     20                     False              False
fileserver.mydomain.local False    2001:470:xxxx:1:dcf6:506c:92c3:44f8  2001:470:xxxx:1::32                  13                     20                     False              False
fileserver.mydomain.local False    2001:470:xxxx:1:9044:f958:ceea:38eb  2001:470:xxxx:1::7                   10                     20                     False              False
fileserver.mydomain.local False    2001:470:xxxx:1:e015:d656:df8:cc26   2001:470:xxxx:1::5                   2                      20                     False              False
fileserver.mydomain.local False    2001:470:xxxx:1:f88a:5a9d:ad3e:2719  2001:470:xxxx:1:4de1:3ba4:ff38:eb28  20                     18                     False              False
fileserver.mydomain.local False    2001:470:xxxx:1:4014:a2e0:b21d:b9d7  2001:470:xxxx:1:5c28:9c44:8f70:16d9  20                     15                     False              False
fileserver.mydomain.local False    2001:470:xxxx:1:1595:ee92:49ed:faca  2001:470:xxxx:1:487f:b7f4:37eb:9002  2                      8                      False              False
fileserver.mydomain.local False    fda9:26a9:1c47:1:9044:f958:ceea:38eb fda9:26a9:1c47:1::199                10                     20                     False              False
fileserver.mydomain.local False    fda9:26a9:1c47:1:e015:d656:df8:cc26  fda9:26a9:1c47:1::32                 2                      20                     False              False
fileserver.mydomain.local False    fda9:26a9:1c47:1:1595:ee92:49ed:faca fda9:26a9:1c47:1:8581:c700:1790:61e9 2                      20                     False              False
fileserver.mydomain.local False    fda9:26a9:1c47:1:4014:a2e0:b21d:b9d7 fda9:26a9:1c47:1::160                20                     20                     False              False
fileserver.mydomain.local False    fda9:26a9:1c47:1:b8c3:794b:32bf:d7fe fda9:26a9:1c47:1::33                 10                     20                     False              False
fileserver.mydomain.local False    10.0.1.47                            10.0.1.233                           2                      10                     False              F
    0 comments
  3. Gloria Gu 3,891 Reputation points
    2020-09-10T02:42:00.113+00:00

    Hi Naspterbarter ,

    SMB Multichannel will only work if your network interface reports itself as RSS-capable. You can check that with the Get-SmbServerNetworkInterface or the Get-SmbClientNetworkInterface PowerShell cmdlets.Some desktop-class NICs might say they don’t support RSS.
    23692-39.png

    Another possibility is that the NIC reports itself as RSS-capable but with only one queue, which effective means that using multiple connections will not help.You can verify that using the Get-NetAdapterRSS cmdlet.
    23677-40.png

    In general that works fine, but in certain configuration it can lead to unexpected behavior.Also, you have to make sure that the NIC configuration wasn’t changed to disable RSS. This can be done using PowerShell cmdlets (Enable-NetAdapterRss and Disable-NetAdapterRss) and is also commonly found under the advanced properties pages for the NIC.
    23678-41.png

    So the possible causes of your issue are:
    (1) Your WIN10 client's 4 NICs are not all RSS-capable.
    (2) The NICs reports themseves as RSS-capable but with only one queue.

    Getting the right type of NIC with the right RSS-capable driver is always your best choice. You can try to:
    (1) Update the adapters to the lastest version
    (2) Use the RSS-capable NICS on your client

    ============================================

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    0 comments
  4. Napsterbater 1 Reputation point
    2020-09-10T13:14:07.917+00:00

    No RSS is not required for SMB multi-channel. It adds additional benefits and performance increases. But it is not required. You even said it in your first reply that without RSS one connection per interface. Not just one connection.

    This is also proven even with RSS turned off on both the client and the server SMB multi-channel works perfectly fine when transferring from the server to the client. And again the client is showing multi-channel connections. And again multi-channel is in use sort of because the server when receiving is spreading the load over five different network interface cards which means it is a multi-channel connection. It's just that the client is sourcing it from a single one. And note it's the same four-port adapter in both systems. And again whether RSS is on or off the symptoms remain the same.