Dell Storage with Microsoft Storage Spaces Deployment Guide

Dell recommends that you use five distinct subnets for Scale-Out File Server configurations. The first subnet is used for cluster management and AD integration. This subnet can leverage an existing network infrastructure. Two high-speed storage networks are used for external client communication (Layer 3-routable). Other two subnets are used for intra-cluster communication (does not require Layer 3 routing).

You must have each redundant pair of subnets routed through two physically separate switches.