A Pivot3 Acuity "cluster" is called a Pivot3 virtual Performance Group (vPG). vPGs can only consist of like platforms (Hybrid nodes vs. All-flash nodes).

However, Pivot3 Acuity Hybrid (2x00) and All-flash (6x00) nodes can co-exist within the same Pivot3 Domain (aka "Federation"). All nodes in the Domain can be managed via a single pane of glass.