How 2 add Iscsi Storage 2 opennebula 5.8


i try to add a Fujitsu dx100 iscsi to my opennebula cluster (8host and 3 mon).
I add it via webinterface. After adding it seem to work well but the size is allways 1 mb, I checked the chap and the iqn. both is correct. I tied it without chap. nothing allways 1mb.

when i add it direkly to the kvm node of the cluster everything works well.

my question is. Is it possible to use a real iscs Storage with opennebula without using a thirdparty addon?