1. A system comprising: A high speed private local area network (LAN); and a logical cluster of appliances comprising a plurality of physical sub-clusters of appliance nodes, wherein each node of said appliance nodes comprises a different generation node, wherein said plurality of sub-clusters are interconnected via said high speed private LAN, wherein a sub-cluster (N) of said plurality of physical sub-clusters comprises a first plurality of nodes of said appliance nodes, wherein said sub-cluster (N) is associated with a plurality of (M) generation appliances of said logical cluster of appliances, wherein each appliance of said plurality of (M) generation appliances comprises a same type of appliance, wherein (N) comprises a first cluster number, wherein (M) comprises a first generation number of a first generation, and wherein said plurality of sub-clusters, in combination, form a single logical cluster.