How are you determining that you are getting bad performance? Is this based upon latency, low bandwidth, errors...
or some other indicator? And, what is or should be normal?
What is the effective speed of the WAN interface compared to the theoretical (quoted bandwidth)? How are the buffers configured on the destination devices, and what type of devices are they? Have you spoken with the McData technical support folks and/or the technical support folks of storage devices that are using the routers?
Lastly, can other applications get better bandwidth and utilize a larger MTU on the same WAN interface to determine if it is the routers or a combination of destination and source devices?
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