Did you enable Jumbo Frames on the switch, the vSwitch and the port group? The SAN itself runs at 9000 MTU but if your physical switches, virtual switches and port groups segmenting of the packets will occur. I've still got a whitepaper from Dell on how to configure an Equallogic array with VMware. If you're interested, send me a PM, I'll be sure to send it to you. Perhaps you can review the configuration then.
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