Scale-out vs. scale-up is somewhat of an academic discussion, customers should ultimately be asking about the max capacity a given cluster can support, and how much hardware / RUs / cost is required to get there. Pure was designed with a similar Infiniband/RDMA clustered controller interconnect architecture to XtremIO, we’ve just focused first on maximizing vertical scale before horizontal scale (vertical scale is more cost-effective than horizontal scale, horizontal scale becomes important when you need to expand performance beyond what vertical scale can deliver).