It’s Good to Be Odd (and > 1)

In terms of distributed systems there has been an evolution from simply marshaling resources of multiple devices (usually lower-end or commodity hardware) to actively controlling entire ecosystems of related processes and assets across multiple datacenters and types. In its earliest form, a distributed system was basically a cluster. While the term cluster has many different connotations depending on the field in which it is used, the earliest of these beasts generally contained locally accessible hardware and the hardware was generally considered to be symmetrical.