Here is a link to a pretty decent overview of data center physical standards, including temperature and humidity. Too wet and your drives will rust in place. If the room is too dry static electricity can be a problem. In the future I'd love to pull the data off our AC units as well, but I haven't had time for that yet.ĮDITED: You should be looking for humidity between 40% and 55%. When we suspect we have a hot spot we can just stick unit there and get a visual check on it in a minute or less. We also have a bunch of standing thermometer/humidity sensors that are non automated dials. In theory the physical plant people at the university are also monitoring the room, but they don't seem to notice or care as often as we do. We also have bigbrother alerting us when the temperature or humidity hits certain thresholds. We're polling SNMP data from them and running it through MRTG for trending and graphing. I just recently added 3 more sensors to the unit so we're monitoring four different places in our main data center. They have both temperature and humidity sensors. We're using Sensatronics EM1 monitors to be precise. We have a couple things going on in the data center for temperature monitoring. The earlier you diagnose an AC/HVAC problem, the longer you will have to fix it before you start damaging components, having to shut down machines, or having machines shut down on their own to protect themselves. They're great backup for reporting thermometers, and you'd be surprised how often a problem will be spotted by a human glancing at the therm as they walk in and out of the room before the warning range of the monitoring thermometers is crossed. In addition to walking around with a thermometer to get a feel for the temperature pattern in the room, buy some cheap non-connected thermometers and hang them from the ceiling. I also second and extend a comment josephkern made in his answer. We plugged it into nagios and it worked like a champ.
They have an HTTP interface which could be scraped if you wanted, but also support SNMP traps and polls. They allow multiple temperature sensors and they have some nifty add ons like air flow monitoring (which we aren't currently using) and things like door open/close detection (which we are). I will admit I wasn't involved in the evaluation process for these, but I really like the product.
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