Install ESX 4 on iSCSI SAN?

Hi,

i'm quite new to esx and SAN, so perhaps this question is quite simple to answer... i tried google for several hours, but couldnt find any suitable answers.
got 2 dell r610 (broadcom 5709 with toe and iscsi offload, NO local disks/controller) and one md3200i. this configuration was made by dell, i just told them, we need a functional eviroment for 2 servers and storage. so they told me: go with diskless and install esx an flashdrive...

i tried that, but discoverd after serveral hours that it is not possible to do a flash-only install, because esx needs a vmfs-partition for the serverconsole datastore, which will be created during install. great
so i thought: hey, i got 2tb worth of diskspace on the md3200, why not use some of that for the datastore... so i created 2 dedicated LUNs and defined one r610 each as a host. in the storage-manager the md3200 detected the boradcomes as initiators...

so i fired up the install... and what the frag, no SAN to choose from...
connection between nics and md3200 is working (when i select the nic as boot device, it connects to the md3200)...

what am i missing? what did i wrong? or is this not possible and we have to purchase local disks/controllers (which would be very "sad", because the whole system setup was a recommendation by dell)

thanx for your help