Question : ESXi 4 and Dell MD3000 - getting them to work together

I have a Dell r905 with embedded ESXi 4.0. I put a host of Windows 2008 R2 and connected up and MD3000 (note, NOT an MD3000i). I first tried to add the storage as an RDM, but that is greyed out. Then I tried to add just as a simple datastore: it sees 2TB but says only 45gigs are available. This inability to even add as a datastore is confusing to me. All of this equipment includng HBA SAS 5/E card is on the HCL for VMWare.

The first confusing issue: when you configure host access to a virtual disk on the SAN, what host do you use, the ESXi proper or the Windows 2008? It only sees the Windows 2008 I assume because of drivers.

The LUN is visible to the ESXi under "devices" when you go to storage. The RDM is greyed out, and it's not because there is a datastore taking it (I tried the RDM first, then when playing with the datastore,  created it, deleted it, rescanned storage devices several times and  even rebooted). Still greyed out.

Any ideas on this will be greatly appreciated.

Answer : ESXi 4 and Dell MD3000 - getting them to work together

Both actually
i use 3 like-sized LUNs in my environment. when i found the maximum it would take i just sized them all that way. specifically the RDM i use for my user file server. performance boost for sure