Fcoe Traffic In A Read Operation From Storage; Fcoe Traffic Plus Tcp Traffic In A Read From Storage - Qlogic Storage Networking (Unified Fabric Pilot Installation Manual

5–Validation Methods for DCB and FCoE
Validation Step 5—ETS Verification
Figure 5-21 shows that the FCoE traffic is read at the rate of 837MBps. The
throughput numbers on ports (1,1,1) and (1,2,2) are equal, indicating that all traffic
from the FCoE storage is going to the server. The throughput of 837MBps
represents the maximum rate for FCoE in this configuration.
Figure 5-21. FCoE Traffic in a Read Operation from Storage
In Figure 5-22, TCP read traffic starts while maintaining the FCoE read
operations. The traffic throughput from the switch on GE SW(1,2,2) increases to
approximately the full line rate (1176MBps). Because the traffic reached full line
rate, the switch enforced ETS parameters. The FCoE traffic decreases to
600MBps, as seen on port GE Storage(1,1,1). The difference between the full line
rate (1,176MBps) and the FCoE traffic (600MBps) is the TCP traffic (576MBps).
The speed of 576MBps represents 49 percent of the full rate, which corresponds
to the switch ETS configuration of 50 percent for FCoE and 50 percent for others.
The switch is behaving as expected.
Figure 5-22. FCoE Traffic Plus TCP Traffic in a Read from Storage
To validate that the switch is not disrupting FCoE traffic while reducing it, capture
a trace of the full line rate traffic, and then open it in Expert for analysis. Because
the capture is taken on both sides of the switch, it is possible to run a cross-port
analysis in Expert.
51031-00 A 5-21