Primavera 8.3.3 instal for a Large Company setup

Hi Gurus,

In our company we are about to impliment full scale ebs 12.1.3 with other systems like Primavera, OBIEE, etc etc

We have installed Primavera 8.3.1 and applied patches to make it version 8.3.3.  The installation architecture is as follows:

1.All our servers OEL 6 x86-64 bit.

2.3 different virtual machies(one for Application Server and P6EPPM, one for Web Server and one for Database Server)

We are coming very close to implimentation stage.  Now the Primavera consultants suddenly saying that the present set up not good enough for Large Company like ours which has few hundered thousands of projects to be loaded into Primavera application.  At the moment our priority is Optimum performance, not high availability.