OVH punts hybrid water and immersion cooling for high performance systems
European cloud operator OVHcloud has just celebrated 20 years of using water cooling technology in its datacenters, leading up to the development of a hybrid system that combines both water and immersion cooling to drive greater efficiency when operating demanding workloads.
When it comes to the company's use of liquid cooling, in the meantime, it was initially driven purely by a desire to pack more servers into a rack to increase density in the datacenter and thereby lower costs, according to the company's Global Environmental Director, Grégory Lebourg. However, it has also been beneficial for environmental factors, such as cutting energy and water use, he claimed.
But not all the heat is generated by the CPU, some of it comes from other components such as the memory, hard disks or SSDs, so OVH still uses air cooling here, with the airflow through the server to an air-water heat exchanger at the back of the rack, which it calls the"fridge door," with fans to pull the air out of the of the rack.
Because of this cooling system, OVH does not need to control the inside air temperature or the humidity level, so it can use existing buildings rather than purpose-built datacenter structures, according to Lebourg. The company developed this approach because it was not satisfied with the immersion cooling technologies that were already on the market, Lebourg said, finding them compromised in one way or another.
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