Blade servers use less power than traditional (i.e. 1U) servers. However, when they are housed compactly in a single rack (Figure 1), the increased power required and heat dissipated lead to the creation of hot spots in some data centers.
It is unlikely that a traditional data center, with computer room air conditioning (CRAC) units supplying airflow through a raised-floor plenum, will be able to deliver a cooling capacity of more than 3 kW to any rack, regardless of quantity and capacity of CRAC units and floor depth. The maximum cooling capacity delivered to a single rack will be even less for rooms with flooded-aisle air distribution over a non-raised floor.
Rack-based cooling solutions are now appearing which take cooling capability to levels well in excess of 10 kW per rack.
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