Dell Emulex Family of Adapters - Manual (Page 626)

Emulex Drivers for Windows User Manual P010077-01A Rev. A
3. Configuration
NIC Driver Configuration
626
Once the Emulex driver is loaded, the Emulex SR-IOV virtual function is used for all
unicast receive and transmit traffic. The emulated NIC handles multicast and broadcast
traffic. If SR-IOV is disabled, the Emulex adapter is removed from the virtual machine,
and all traffic automatically uses the emulated NIC. This technology allows Live
Migration of Virtual Machines when using SR-IOV.
Note: If multiple adapters are added to the virtual machine, Emulex recommends
using MAC addresses to map the Emulex Network adapter to the
corresponding Microsoft Virtual Network adapters.
Verifying SR-IOV
When SR-IOV is working, it can be verified by opening the Device Manager within the
virtual machine and examining the information about the transmit and receive packets
that are using the SR-IOV virtual function. This is the final verification that SR-IOV is
working correctly. SR-IOV can also be verified from the host Hyper-V server.
Note: Because current versions of Windows Server 2012 require that SR-IOV be
enabled in different locations prior to creating the virtual switch, if SR-IOV is
not working, delete the virtual switch and create it again. The SR-IOV option is
always available during switch creation.
Verifying SR-IOV from the Virtual Machine
To verify the SR-IOV from within the virtual machine:
1. From within the virtual machine, select:
Server Manager>Dashboard>Tools>Computer Management
2. Click Device Manager. The Device Driver opens. See Figure 3-4 on page 623.
3. Open the Network Adapters item, click the Emulex device and right-click. Select
Properties from the context-menu. The Properties dialog box opens showing the
Driver page. See Figure 3-5 on page 624.
Note: The Emulex adapter may initially appear as a “Network Adapter” before
the driver is loaded.
4. Select the Statistics tab. Information about the transmit and receive packets that are
using the SR-IOV virtual function are displayed; specifically, the number of
“Transmit Bytes” and “Receive Bytes” that are transmitted directly to hardware
from the virtual function. If this number is greater than zero, the device is
successfully using the SR-IOV direct hardware access.