Re: Vsphere 5.1 And Windows 2008 R2, Define a disk grater than 2TB

i see the option RDM grey out, is because i use Vsphere instead of Vcenter ?   

We 've purchased VMware vCenter Server 5 Essentials for vSphere  (Have the license key but don't find where to download it)

We need it for the RDM right ?