6.7

Procedure
1 Locate the virtual machine in the vSphere Web Client.
a Select a data center, folder, cluster, resource pool, or host and click the VMs tab.
b Click Virtual Machines and double-click the virtual machine from the list.
2 Power off the virtual machine.
3 On the Configure tab of the virtual machine, expand Settings and select VM Hardware.
4 Click Edit and select the Virtual Hardware tab in the dialog box displaying the settings.
5 From the New device drop-down menu, select Network and click Add.
6 Expand the New Network section and connect the virtual machine to a distributed port group.
7 From the Adapter type drop-down menu, select PVRDMA.
8 Expand the Memory section, select Reserve all guest memory (All locked), and click OK .
9 Power on the virtual machine.
Network Requirements for RDMA over Converged Ethernet
RDMA over Converged Ethernet ensures low-latency, light-weight, and high-throughput RDMA
communication over an Ethernet network. RoCE requires a network that is configured for lossless traffic
of information at layer 2 alone or at both layer 2 and layer 3.
RDMA over Converged Ethernet (RoCE) is a network protocol that uses RDMA to provide faster data
transfer for network-intensive applications. RoCE allows direct memory transfer between hosts without
involving the hosts' CPUs.
There are two versions of the RoCE protocol. RoCE v1 operates at the link network layer (layer 2). RoCE
v2 operates at the Internet network layer (layer 3) . Both RoCE v1 and RoCE v2 require a lossless
network configuration. RoCE v1 requires a lossless layer 2 network, and RoCE v2 requires that both layer
2 and layer 3 are configured for lossless operation.
Lossless Layer 2 Network
To ensure lossless layer 2 environment, you must be able to control the traffic flows. Flow control is
achieved by enabling global pause across the network or by using the Priority Flow Control (PFC)
protocol defined by Data Center Bridging group (DCB). PFC is a layer 2 protocol that uses the class of
services field of the 802.1Q VLAN tag to set individual traffic priorities. It puts on pause the transfer of
packets towards a receiver in accordance with the individual class of service priorities. This way, a single
link carries both lossless RoCE traffic and other lossy, best-effort traffic. In case of traffic flow congestion,
important lossy traffic can be affected. To isolate different flows from one another, use RoCE in a PFC
priority-enabled VLAN.
vSphere Networking
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