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10G Fiber Connection Slow

 I've installed some older brocade 1020 cards in my server's for a 10Gig connection. I then switched my vswitch physical adapter over to fiber and all the vm adapters over to vmxnet3. My transfer speeds then dropped to 50MBps down from the normal 100MBps when on the fiber connection. I then switched my physical adapter back to the 1G adapter on the vswitch and my speeds went back up. Anything special I need to do?

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Adjusted the MTU to 9000 on the vSwitch and I got the correct speed

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