6.7

Table 1‑72. Networking Performance Enhancement Advice (Continued)
# Resolution
4 Assign each physical NIC to a port group and a vSwitch.
5 Use separate physical NICs to handle the different traffic streams, such as network packets generated by virtual machines,
iSCSI protocols, vMotion tasks.
6 Ensure that the physical NIC capacity is large enough to handle the network traffic on that vSwitch. If the capacity is not
enough, consider using a high-bandwidth physical NIC (10 Gbps). Alternatively, consider moving some virtual machines to a
vSwitch with a lighter load or to a new vSwitch.
7 If packets are being dropped at the vSwitch port, increase the virtual network driver ring buffers where applicable.
8 Verify that the reported speed and duplex settings for the physical NIC match the hardware expectations and that the
hardware is configured to run at its maximum capability. For example, verify that NICs with 1 Gbps are not reset to 100 Mbps
because they are connected to an older switch.
9 Verify that all NICs are running in full duplex mode. Hardware connectivity problems might result in a NIC resetting itself to a
lower speed or half duplex mode.
10 Use vNICs that are TCP Segmentation Offload (TSO)-capable, and verify that TSO-Jumbo Frames are enabled where
possible.
Network Rate (Mbps)
The Network Rate chart displays network bandwidth on a host.
The Network Data Transmitted/Received chart for hosts is located in the Home view of the Host
Performance tab.
Table 1‑73. Data Counters
Chart Label Description
Data Receive Rate Rate at which data is received across the top ten physical NIC instances on the host. This
represents the bandwidth of the network. The chart also displays the aggregated data
receive rate of all physical NICs.
n
Counter: received
n
Stats Type: Rate
n
Unit: Megabits per second (Mbps)
n
Rollup Type: Average
n
Collection Level: 3 (4)
Data Transmit Rate Rate at which data is transmitted across the top ten physical NIC instances on the host. This
represents the bandwidth of the network. The chart also displays the aggregated data
transmit rate of all physical NICs.
n
Counter: transmitted
n
Stats Type: Rate
n
Unit: Megabits per second (Mbps)
n
Rollup Type: Average
n
Collection Level: 3 (4)
vSphere Monitoring and Performance
VMware, Inc. 62