Stu,       All you should have to do is expand the existing storage pool at the array level and then refresh the smi provider and vnx array inside of ViPR.  ViPR should now see the additional capacity available to it.  Please let me know if I can help with anything else.  Andrew
Hi all,  Does anybody know if it possible to grow/expand an existing VNX storage pool that is being managed by ViPR? and if so what steps are required? 
Growing an existing VNX storage pool that is being managed by ViPR