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Some people out there, such as in this post, have noticed a statement in the ESXi 4.0 Configuration Guide which says (on page 54):

"Jumbo frames are not supported for VMkernel networking interfaces in ESXi"

I am happy to say that this is merely an error in the documentation.  In fact, ESXi 4.0 DOES support Jumbo Frames on VMkernel networking interfaces.  The correction will hopefully appear in a new release of the documentation, but in the meantime, go ahead and configure Jumbo frames for your ESXi 4.0 hosts.

About the Author

Charu Chaubal

Charu Chaubal is the Director of Technical Marketing for the Cloud Platform Business Unit at VMware, and runs the team that works on the vSphere product line. He has been at the company since 2006, and has been responsible for customer education and sales enablement for a wide range of datacenter technologies, such as hypervisor security, virtual networking, hyperconverged storage, and Big Data. Previously, he worked at Sun Microsystems, where he had over 7 years experience with architecting distributed resource management and HPC infrastructure software solutions.