Openfiler is a solution, but IMHO for testing purpose.
Or you have native iSCSI, or you can use guest extends.
Note that VMFS extend does not help, cause you can have a VMFS datastore greater than 2 TB, but your vmdk files will still have the 2 TB limit.
Andre
Andre | http://about.me/amauro | http://vinfrastructure.it/ | @Andrea_Mauro
