Understanding Micro Data Center Modules (MDC) and Their Benefits

In the past two to three years, rapid advances in distributed computing, rack servers, and internet technologies in China have led to new data‑center applications such as in‑row cooling, natural cooling, high‑voltage DC, and direct‑current power supplies, culminating in the emergence of micro data‑center modules (MDC, or microdata center). The article questions the actual benefits of micro modules, their necessity for enterprises, and aims to provide a neutral analysis.

The author defines a micro module as a standardized integration of compute or storage resource requirements—treated as a "datacenter as a computer"—with supporting infrastructure (power, cooling, rack space) into a single, coupled module. It is a product of the modular data‑center process and a key component of the modular data‑center ecosystem. The author references Schneider APC’s whitepaper No. 160 for a detailed definition and characteristics.

Research of over 100 overseas medium‑to‑large data centers shows a growing trend toward modularization. Micro modules, pioneered by large internet firms such as Google, Yahoo, and Tencent, typically consist of 10–30 racks placed close to cooling sources, modular AC/DC UPS, sealed aisles, and monitoring systems. Their logical structure can be viewed at two layers: ICT and infrastructure, as illustrated in the accompanying diagrams.

The development of micro modules is driven by infrastructure vendors offering modular products and the strong demand from internet companies. Early examples include Schneider APC’s 2005 “In‑Row” system and Emerson’s 2009‑2010 SmartAisle solution, which introduced sealed cold aisles and bus‑bar power distribution. Subsequent vendors (e.g., Weitu) added similar offerings. These standardized hardware components enable higher power‑efficiency, reduced CAPEX and OPEX, and better integration with server and network equipment.

Internet giants have adopted micro‑module concepts to meet their highly variable workloads. Google designs its own servers and groups three‑rack cabinets with a top‑mounted cooling unit; Facebook’s OCP platform creates open‑source servers and a unified cooling system; Yahoo aggregates about ten racks into a module with N+1 cooling and shared flywheel UPS. These implementations demonstrate how business‑driven hardware customization can be productized for rapid, scalable deployment.

The article then explores whether micro modules are universally applicable. It notes that enterprises must be able to model their business, possess technical control to translate those models into standardized hardware, and have sufficient scale to justify the investment. Cloud‑computing virtualization and open‑compute platforms can mitigate some challenges, but heterogeneous ICT equipment and limited growth may hinder adoption. TCO considerations, including CAPEX/OPEX trade‑offs, are critical when evaluating micro‑module suitability.

In conclusion, modularization is a strategic data‑center solution, and micro modules represent a natural evolution within this paradigm, standardizing server, network, power, and cooling resources for fast, large‑scale deployments. As modular concepts continue to mature, they will influence traditional data‑center designs, driving further innovation and efficiency.