Ah i have alreday see this. I though that you might have been showing something different. I  have 4 x 1GB connections coming from EMC CX3-40 ISCSi  in to ESXi 5.0, 5.1 and 5.5 hosts (experimenting here)  and i cannot get more that 2 x paths to show active. All documentation online shows 1 x path, 2 x path  but no 4 x path. Was possibly looking for something in ESXCLI to address volume sessions? I understand that there is a default for 2. Then not sure what to do about round robin.

10.1.2.18, 10.1.3.18, 10.1.4.18, 10.1.5.18,  all in same Vlan,