You must create the vSwitch and change the MTU to 9000.  For this example, vSwitch7 will be the name you would replace with your own:

esxcfg-vswitch -a vSwitch7

Then, set the MTU of the vSwitch:

esxcfg-vswitch -m 9000 vSwitch7

esxcfg-vswitch -l - will list all the vSwitches on actual ESXi. It should look something like this:

Switch Name    Num Ports   Used Ports  Configured Ports  MTU     Uplinks

     vSwitch7             64                  1            64                 9000

iSCSI access is controlled by a VMkernel interface and assigned to a port group on the vSwitch.

So create the portgroup:

esxcfg-vswitch -A vSwitch7

Then create the VMkernel interface:

esxcfg-vmknic -a -i -n -m 9000

If you named the port group "iSCSI_storage", for example, and your IP is 192.168.0.1/24, the command would be like this:

esxcfg-vmknic -a -i 192.168.0.1 -n 255.255.255.0 -m 9000 iSCSI_storage

The last step is to add a physical NIC to the vSwitch.  This can be done via the GUI optionally:

esxcfg-vswitch -L vSwitch7

You must enable jumbo frames on your physical switch for this to work!

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