The density of our data centers has increased since 2004 as we expanded our rate of virtualization, proactively refreshed our servers and storage with the latest generation of Xeon processors, and consolidated the number of data centers. As a result we had to innovate and optimize the efficiency and reliability of our data center facilities to accommodate the increasing cabinet sizes from 15kW to 22.5kW and to 30kW currently. We focused on 4 key areas to optimize: Air and Thermal management, Architecture, Electrical, and Harvesting Stranded Capacity. Read this data center facilities paper to learn and see (in 3D color) how our facilities changed as we increased the density of our data centers.
For low-density cabinets up to 15kW, we use traditional computer room air conditioning (CRAC) units in the return airstream without any air segragation as illustrated below:
For 22.5 kW cabinets, we use hot aisle enclosure (HAE) with the CRAC unit in the return airstream as illustrated below:
For 30 kW cabinets, we use flooded supply air design and passive chimneys as well as HAEs as shown below:
For some facilities with a raised metal floor (RMF) we still use a flooded air design by raising the room air handlers' supply path above the RMF as shown below:
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