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Dell Storage with Microsoft Storage Spaces Deployment Guide

Enabling SMB Direct

An advantage of iWARP RDMA technology is that you can route it across different subnets. While the common setup is a single subnet, the Chelsio RDMA adapter can connect servers across subnets; but this capability is disabled by default on Windows Server 2012 R2.

To enable SMB Direct for operation with a Chelsio adapter, you must configure every server (SMB Servers and SMB Clients) to allow routing RDMA across subnets. SMB client configuration is not described in this document and you must configure it separately.

  1. Start a Windows PowerShell instance with Administrative privileges.
  2. Run the following PowerShell cmdlet to enable SMB routing.
    Set-NetOffloadGlobalSetting -NetworkDirectAcrossIPSubnets Allowed 
  3. Disabling and reenabling the interface makes the settings change effective without a restart. Run the following commands at the PowerShell prompt, where < string > is the name of the NIC (External1, External2).
    Disable-NetAdapter -InterfaceAlias <string>
                                        Enable-NetAdapter -InterfaceAlias <string> 

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