In my post last year, Moving to SUSE I said I would spend more time explaining what Hyperconverged Infrastructure (HCI) was.
The way I would describe HCI is that it’s a way of structuring a data center so that the storage, compute, and networking resources are all bundled into the same boxes, and then software abstracts over it, allowing nodes to use resources of other machines.
An example of something that’s not HCI is a SAN, or a Storage-Area Network.