Raid,
Not all datacenters have a proper extraction system. I also use the temp readings of my hot aisles to determine where more cooling is needed in my cold aisles; or where I should/should not add more equipment. If I have a temperature difference of 10 degreen between an area in a hot aisle and say 5 racks down in that same hot aisle, I usually have a decent indicator of oversubscribed cooling.
For example, I have a rack that is around 10 years old and has had 30ish 1U servers in it. We noticed a significant hot spot in that hot aisle during a heat wave. It turned out that there was a problem with a) not enough cooling in one of the cold aisles and b) a rebreathing issue in the other cold aisle.
I personally do not care about the exhaust temperature of a server unless I am trying to find a set of machines that is causing hot-spots. In that same regard, I do not really care about the temperature inside of a rack either.
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