Qlogic Storage Networking (Unified Fabric Pilot), Installation Manual

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5–Validation Methods for DCB and FCoE
Validation Step 5—ETS Verification
5-24 51031-00 A
Figure 5-26 shows the relationship between FCoE, TCP, and pause frames.
Before the start of TCP traffic, server ingress is equal to the FCoE traffic. When
the TCP traffic starts, server ingress is the sum of the FCoE and TCP traffic. The
switch starts sending PFC pause requests to the storage when the TCP traffic
starts to slow the FCoE traffic going to the server.
Figure 5-26. Relationship Between FCoE, TCP Traffic, and Pause Frames