Power and cooling are the critical services demanded of a data centre facility, yet diagnosing problems and fixing them while keeping the infrastructure running can be surprisingly difficult. Yet they've never been more important as virtualisation increases the concentration of critical resources in the data centre. For example …
Of course you could read the proper guide to fixing this problem
By just going and looking at the EU Code of Conduct Best Practice guide which explain all of this rather more comprehensively and deals with the other steps you should be taking.
In the meantime stop buying high density IT equipment which creates local cooling problems until you have sorted out your airflow by containing either the hot or the cold air, yes, that practice is covered in the doc above too. High density does not mean high efficiency, it just means lots of empty spaces in racks which are out of power and cooling capacity.
More often than not it's cold air bypassing equipment, straight back to the CRAC from the grilles that hampers their performance (assuming the CRACs are controlled to return temperature, as is usually the case). The control system will sense cold return air, and decide to ramp down even though equipment might be overheating and your coolant temperature is correct.
It sounds a bit haphazard to me trying to hunt down and fix hotspots...you'll be forever doing this when you make changes to the grilles/blanking if you don't have the perfect facility. Best bet is to conduct a CFD study if you can afford it...you'll then be able to simulate potential fixes to find the best one for your data centre as well as identify all the hotspots in one go.
No, best is
To permanently sort the airflow by migrating to hot / cold containment so that you don't have to engage in turd polishing by fuddling about with floor tile positions or having that shaman in to cast spells on your airflow.
They are pouring in seawater to cool it. It will be under control soon.
...What is that? Wrong article you say?
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