1、隱藏的泄漏：冷空氣從活動地板下的空間中泄漏出來，進入到相鄰的空間或支撐柱中。這種泄露相當(dāng)?shù)钠毡椋?dǎo)致了冷通道機房環(huán)境中的壓力損失，從而使得別處滿是灰塵的熱空氣或潮濕的空氣進入進來。避免這個問題的方法便是去活動地板底下檢查周邊和支撐柱，并封住你發(fā)現(xiàn)的任何漏洞。
1. Hidden leakage: cold air leaks from the space under the raised floor and enters the adjacent space or support column. This kind of leakage is quite common and leads to the pressure loss in the cold channel machine room environment, which makes the hot air or wet air filled with dust enter elsewhere. The way to avoid this problem is to check the surrounding and supporting columns under the raised floor and seal any holes you find.
2、太多的開孔地板：在熱通道和空白區(qū)域放置開孔地板是毫無理由的。這樣會浪費冷卻能力。還有可能是在機架的進氣口放置了太多的開孔地板。IT機架頂部的溫度低于正常溫度便是一大危險信號。
2. Too many perforated floors: There is no reason to place perforated floors in hot channels and empty areas. This will waste cooling capacity. It is also possible that too many perforated floors are placed at the air inlet of the rack. The temperature at the top of the IT rack is lower than the normal temperature, which is a big danger signal.
3、未密封的活動地板開口：盡管許多冷通道數(shù)據(jù)中心運營商已經(jīng)努力密封了電纜開口及活動地板中的其他漏洞，但很少人完成了這項工作。剩下的漏洞會導(dǎo)致大量的冷空氣逸入不被需要的區(qū)域。配電單元或遠(yuǎn)程電源板等電氣設(shè)備是尋找未密封開口的一個特別重要的地方。
3. Unsealed raised floor openings: Although many cold channel data center operators have tried to seal cable openings and other holes in the raised floor, few people have completed this work. The remaining holes will cause a large amount of cold air to escape into the unwanted area. Electrical equipment such as power distribution unit or remote power panel is a particularly important place to find unsealed openings.
4、機架密封性不好：把備用面板放置在空的機柜區(qū)域是氣流管理的常識，然而并不是每個人都會這樣做。一些機柜沒有被設(shè)計好，安裝鋼軌與機柜邊緣之間被封死。關(guān)心效率的經(jīng)營者會密封那些開口以及機柜底端的潛在開口。
4. The sealing of the rack is not good: it is common sense to place the spare panel in the empty cabinet area, but not everyone will do so. Some cabinets are not well designed, and the installation rail and the cabinet edge are sealed. Operators concerned with efficiency will seal those openings and potential openings at the bottom of the cabinet.
5、溫度和濕度傳感器刻度不準(zhǔn)：有時供應(yīng)商使用了未校準(zhǔn)的傳感器，有時刻度會隨著時間的推移而變得不準(zhǔn)確。這將導(dǎo)致管理不善的冷卻單元不能協(xié)同地工作。建議運營商每六個月校準(zhǔn)一次溫度和相對濕度傳感器，并且在必要的時候進行相應(yīng)的調(diào)整。
5. Inaccurate scale of temperature and humidity sensor: sometimes the supplier uses an uncalibrated sensor, and sometimes the scale will become inaccurate over time. This will cause poorly managed cooling units to not work together. It is recommended that the operator calibrate the temperature and relative humidity sensors every six months and make corresponding adjustments when necessary.
6、讓CRAC互相牽制來控制濕度：使兩個CRAC互相牽制的另一個好方法是給相鄰的CRAC供以不同溫度的循環(huán)空氣。因此，CRAC有不同的濕度讀數(shù)，一個結(jié)束加濕，而另一個正在干燥空氣。解決這個問題需要巧妙地理解濕度圖，并準(zhǔn)確的設(shè)置濕度控制點。
6. Let the CRACs control each other to control humidity: Another good way to make two CRACs control each other is to supply different temperature circulating air to the adjacent CRACs. Therefore, CRAC has different humidity readings, one end humidification, and the other is drying the air. To solve this problem, we need to skillfully understand the humidity chart and accurately set the humidity control point.
7、物以稀為貴：許多的冷通道數(shù)據(jù)中心運營商預(yù)置了過度的冷卻能力。如果擁有的冷卻能力大于所需，并無法過剩的CRACs的，那么整個的冷卻方案都會被連累，因為太多的單元處于低效率狀態(tài)。地板下的冷卻溫度很高，且某些機架很難被冷卻時，運營商一貫的反應(yīng)便是運行更多的冷卻單元。然而與直覺相反，正確的做法應(yīng)該是運行更少的CRACs來降低負(fù)荷。
7. Thinning is precious: many cold channel data center operators preset excessive cooling capacity. If the cooling capacity is greater than required and the safety of the excess CRACs cannot be guaranteed, the whole cooling scheme will be affected because too many units are in an inefficient state. When the cooling temperature under the floor is very high and some racks are difficult to be cooled, the operator's consistent response is to run more cooling units. However, contrary to intuition, the correct approach should be to run fewer CRACs to reduce the load.
8、閑置的
濟南機箱機柜空間：這是另一個明顯的因素，但出于某種原因沒有被每個人所重視。當(dāng)一個或者多個機柜空間被空置，將會破壞氣流平衡，導(dǎo)致廢氣循環(huán)進入冷通道，或是在冷通道損失冷空氣。這種情況將導(dǎo)致過度冷卻，及供應(yīng)多于實際所需的空氣來彌補損失。
8. Idle Jinan chassis and cabinet space: This is another obvious factor, but for some reason it is not taken seriously by everyone. When one or more cabinet spaces are empty, the air flow balance will be damaged, resulting in exhaust gas circulation into the cold channel, or cold air loss in the cold channel. This situation will lead to excessive cooling and supply more air than is actually required to compensate for the loss.
9、糟糕的機架布局：理想情況下，你想把機架按加熱/制冷分別排成一行，并把主要的CRACs放置在每行的兩端。擁有一小塊機架且沒有特定的方向并不能幫助任何人。無論是從前往后排列機架，還是使CRACs與IT行的方向相同，都無濟于事。
9. Bad rack layout: ideally, you want to arrange the rack in a row according to heating/cooling, and place the main CRACs at both ends of each row. Having a small rack without a specific direction can't help anyone. It doesn't help to arrange the rack from front to back, or make the direction of CRACs and IT lines the same.
10、冷卻管理沒有受到應(yīng)有的重視：沒有想到改進冷卻管理方式的好處，使得運營商的容量擱淺并花費了更高的運營成本。做一些如安裝備用面板等簡單的工作就可以從中獲益，但它們常常被忽視。
10. Cooling management has not received due attention: the benefits of improving cooling management methods have not been considered, resulting in the stranding of operators' capacity and higher operating costs. You can benefit from doing some simple work, such as installing a spare panel, but they are often ignored.
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