You can scale this Ready Stack solution up or out by adding resources. For example:
You can scale resources asymmetrically, which provides a high degree of flexibility and prevents unnecessary overprovisioning of resources. For example, storage resources can be scaled up or out independently of network and server resources. Both Unity XT and Isilon systems allow drive expansion, while PowerSwitch switches support Ports on Demand licensing expansion.
Depending upon your rack power distribution unit (PDU) configuration, scale-out scenarios might require additional racks and have additional thermal requirements. The product documentation details the environmental requirements. As a best practice, place all PDUs on separate UPS circuits. When a port count exceeds a single set of S5248F-ON ToR switches, expand to another set and implement an upstream S9264F-ON as a spine switch to create a meshed leaf/spine architecture.