At console of Open-E DSS V6 Server hit C-A-T, then "7 Treiber Optionen ändern", "qla2xxx" Editieren. There change "qlini_mode" to "disabled".

I disabled "IOStraemingGuard" at the vmware host's FC-Switch Port too, so thw vmware Server recognizes a changed FC LUN mapping without a reboot.