Dell Emulex Family of Adapters - Manual (Page 638)

Emulex Drivers for Windows User Manual P010077-01A Rev. A
3. Configuration
NIC Driver Configuration
638
Figure 3-14 Two SMB Direct Connections Per Interface
The number of connections initiated per RDMA-capable NIC interface, to a particular
server, can be configured using a registry key and the following PowerShell command:
Set-ItemProperty -Path`
"HKLM:\SYSTEM\CurrentControlSet\Services\LanmanWorkstation\Paramete
rs" ` ConnectionCountPerRdmaNetworkInterface -Type DWORD -Value
-Force
SMB multichannel constraints can be used to limit an SMB connection to specific
network interfaces. For example, if you have a 1Gb interface meant for a management
path and one or more 10Gb interfaces meant for the RDMA traffic, you can restrict the
RDMA traffic to the faster 10Gb interfaces by setting SMB multichannel constraints.
You may specify SMB multichannel constraints on the SMB client by doing the
following:

Use only certain RDMA network interface(s) to access a particular server.

Ensure that only “ConnectionCountPerRdmaNetworkInterface” connections
are created per RDMA network interface to a given server
The following figure (Figure 3-15) shows that a multichannel constraint has been added
to specify that only InterfaceIndex 25 should be used to connect to the server
"bench29client1".
Two SMB Direct connections are established on the RDMA Network Interface with
IfIndex: 25. None are established on the other OCe14000-series adapter ports; for
example, the RDMA Network Interface with IfIndex: 26 (20.2.0.110).
Note: On Windows Server 2012, depending on the path used to open the previous
SMB sessions to the SMB server, you may notice multiple instances of
“ConnectionCountPerRdmaNetworkInterface” connections being created while
establishing a single SMB session to the server.