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TinyMiniMicro Cluster Projects?
(alien.top)
heres one thats worthwhile if you have thunderbolt:
I've bought 3 nucs to get 40GBPS networking and HA between them and then run Vmware VSAN express. From there you can go nuts with the possibilites.
I've got four HPs clustered for VMware vSAN and three more little systems -- 2 HPs and a Dell -- clustered as a VMware "remote site" to my PowerEdge primary site.