As Daniel mentioned above
The VxBlock System 1000 can have VMAX 250F/FX, VMAX 950F/FX, or Unity 350F/450F/550F/650F as primary or secondary storage today. In addition, Isilon Gen6 is available for guest access. The VxBlock System 1000 is also the first VxBlock to allow multiple storage arrays from the factory, without the need for a Converged Technology Extension.
As Mark posted above please look at the product overview guide..