This is a very interesting blog entry from Cloudflare about PDU deployments in DCs and the theory behind. Nowadays nearly everything is cloud oriented. But we forget they still need to be deployed physically. In a old job, going dense in physical setups, requires more power and 3-phase PDUs where a must. The blog is quite good explaining the reasons to move to 3-phase and the challenges to balance the power. When you buy “colo”, you buy space and power, and that is not cheap.