Suggestion on node disk space in a cluster

I am building a cluster with 4 identical nodes. Each node can access a net mounted drive served by NetApp. I have a few questions and need some guidance on how to set things up:

  1. What is the recommended disk size on each node?
  2. The NetApp drive size can be increased as needed easily. Is it OK for me to use this NetApp drive for tigergraph installation as well as data?