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15 Configuring iSCSI Connectivity with VMware vSphere 6 and Dell PS Series Storage | TR1075
For each of the VMkernel ports, Jumbo Frames must also be enabled.
1. Select VMkernel adapters, select one of the VMkernel ports from the vSwitch configured for iSCSI
(vSwitch1 in this this example), then click the Edit Setting icon above it.
2. Under NIC settings, change the MTU from the default of 1500 to 9000 and click OK.
3. Repeat this for each of the VMkernel ports assigned to iSCSI.