DSS v7 - Creating an iSCSI storage to add on a ESXi server

I have an ESXi server wich local disk for the virtual servers. I have a Storage server with Open-e DSS v7.
What i like to do is to create an iSCSI volume on DSS wich i can add on my ESXi server and create a datastore on it. So i can create an additional partition in my virtual server.

Could someone help to to accomplish the part in DSS, because i added one, but my ESXi doesn't find it.

You can find many videos that should help you at:
http://www.open-e.com/service-and-su...ts-and-videos/