Had the same issue here. 2 pNICs per host dedicated to iSCSI/vMotion. One pNIC per vSwitch, with iSCSI port binding enabled, vMotion enabled. They attach to dedicated iSCSI switches, on a seperate vLAN and subnet. vMotion failed at 14% and logs show which vmk port they are trying to use. I disabled vMotion on those particular ones and vMotion now works using the other specified ports.
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