This vSAN design is limited to the cluster. The design uses the default storage policy to achieve redundancy and performance within the cluster.
VMware vSAN Conceptual Design
You can use vSAN and traditional storage in the consolidated cluster. However, this design gives guidance only on the implementation of vSAN.
vSAN Logical Design
In a cluster that is managed by vCenter Server, you can manage software-defined storage resources just as you can manage compute resources. Instead of CPU or memory reservations, limits, and shares, you can define storage policies and assign them to virtual machines. The policies specify the characteristics of the storage and can be changed as business requirements change.