Installation guide

5–Validation Methods for DCB and FCoE
Validation Step 4—Validate PFC and Lossless Link
51031-00 A 5-15
Validation Step 4—Validate PFC and Lossless
Link
The critical factor for a successful FCoE deployment is the ability of the virtual
Ethernet link to carry lossless FCoE traffic. Figure 5-14 shows the test
configuration to validate PFC function and to validate that the link is lossless.
Figure 5-14. PFC Validation Setup
Validation Process
The test assumes the following:
 The hosts have storage LUNs mapped and can generate I/O to storage
devices.
 The Analyzer connects to the FCoE switch with a 10 Gbps link, and the
FCoE switch connects to the Fibre Channel storage target with a 4Gbps link.
1. Configure the MLTT test as follows:
 Data size: 512K (writes only)
 Queue depth: eight
 Bandwidth: 100 percent at the Fibre Channel link between the storage
and the FCoE switch
2. Launch the test.
The test is designed to overwhelm the 4Gbps link with Write commands so
that the Fibre Channel link runs out of buffer-to-buffer credits, and the FCoE
switch issues PFC Pause frames to pause the Converged Network Adapter
transmitter.
4Gbps
10Gbps