Hi all
I do not want to start a discussion about "to JumboFrame or not" but if you go for JumboFrames on an iSCSI storage Network I have my concerns about VMwares best practice.
In all papers I found, the recommendation for configuring JumboFrames was Setting the vSwitch to MTU=9000 and the according VMKernelPort (VMK) as well to MTU=9000. My packet would travel from an ESX Point of view like this:
Esx -> VMK (mtu9000) -> vswitch (mtu9000) -> physical iSCSI Switch (Support for JumboFrames enabled: means max mtu=9216) -> storage NIC (mtu=9000)
So the reason my physical Switch has MTU=9216 is to accommodate Overhead. Why this Setting is not recommended for the vSwitch on the ESXi as well? I would rather configure it like this:
Esx -> VMK (mtu9000) -> vswitch (mtu9216) -> physical iSCSI Switch (mtu=9216) -> storage NIC (mtu=9000)
What are your thoughts? Any Feedback more than welcome.