We have G400 and we have both types of hosts iSCSI and FC. We have to reboot the host when we present the LUN from G400, LUN not visible after Windows rescan feature and require reboot. Without Multipathing software multiple LUN should be visible after the presentation from G400 but we must have to reboot the host to visible it. We are facing issue on Iscsi and FC and on Windows 2008/2012. One more thing the reboot is only one time for the 1st LUN from G400 not for every LUN from G400.
We are using HDS HDLM software.