Your network contains a Hyper-V host named Hyperv1 that runs Windows Server 2012.
Hyperv1 has a virtual switch named Switch1.
You replace all of the network adapters on Hyperv1 with new network adapters that support single-root I/O
virtualization (SR-IOV). You need to enable SR-IOV for all of the virtual machines on Hyperv1.
Which two actions should you perform? (Each correctanswer presents part of the solution.
Choose two.)
A.
On each virtual machine, modify the Advanced Features settings of the network adapter.
B.
Modify the settings of the Switch1 virtual switch.
C.
Delete, and then recreate the Switch1 virtual switch.
D.
On each virtual machine, modify the BIOS settings.
E.
On each virtual machine, modify the Hardware Acceleration settings of the network adapter.
Explanation:
The first step when allowing a virtualmachine to have connectivity to a physical networkis to
create an external virtual switch using Virtual Switch Manager in Hyper-V Manager. The additional stepthat is
necessary when using SR-IOV is to ensure the checkbox is checked when the virtual switch is being created. It
is not possible to change a “non SR-IOV mode” external virtual switch into an “SR-IOV mode” switch. The
choice must be made a switch creation time.
E: Once a virtual switch has been created, the nextstep is to configure a virtual machine. SR-IOV in Windows
Server “8” is supported on x64 editions of Windows “8” as a guest operating system (as in Windows “8” Server,
and Windows “8” client x64, but not x86 client). Wehave rearranged the settings for a virtual machineto
introduce sub-nodes under a network adapter, one ofwhich is the hardware acceleration node. At the bottom is
a
checkbox to enable SR-IOV.
Note:
* Steps:
/ SR-IOV must be enabled on virtual switch
/ Install additional network drivers in the guest OS / Enable SR-IOV within the VMs though Hyper-V Manager
* Single Root I/O Virtualization (SR-IOV) is a standard introduced by the PCI-SIG that owns and manages PCI
specifications as open industry standards.
SR-IOV enables network traffic to bypass the software switch layer of the Hyper-V Virtualization stackto reduce
the I/O overhead in this layer. It allows an SR-IOVvirtual function of a physical network adapter to be assigned
directly to a virtual machine to increase network throughput by reducing latency. Host CPU overhead also get
reduced for processing network traffic.
* The diagram below illustrates how SR-IOV allows virtual machines to directly address the physical NIC.
Reference: Everything you wanted to know about SR-IOV in Hyper-V Part 5
C E