hi truetaurus,
you can use any supported storage or storage protocol, your storage is supported since vSphere 5.0 U3...(VMware Compatibility Guide: Storage/SAN Search (keyword VNX5300))
storage pool for vcloud vms:
create a LUN attached via FC or iSCSI to your ESXi Hosts (vCloud), then create a datastore and add a userdefined capability.
then enable storage profiles on this cluster and create a storage profile with the userdefined capabilty and sync this with the vcloud director.
now you can add the storage profile to an existing or new provider vdc and org vdc...
storage pool for mgmt:
create a LUN attached via FC or iSCSI to your ESXi Hosts (MGMT), then create a datastore and deploy or move your mgmt vms to this datastore
i hope this helps
greets from austria
martin