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Five years ago , enterprise data centres were frequently designed with average energy densities as high as 5 kW / rack . Today , new designs are often built with averages higher than 8 kW / rack . The increasing redistribution of workloads to cloud , colocation and edge means less physical space is required in data centres . Increased virtualisation , integrated systems , HCI options and advanced solid-state array ( SSA ) storage require less physical space , but similar amounts of , if not more , energy . This means that more attention must be given to power and cooling systems .

74 FEBRUARY 2020