At 2010-11-23T12:24-0800, Dustin Puryear wrote: > We're moving a few servers from a colo back to the office. Basically, > we have the following: > > 2 Dell 1850 - dual power supply - 1U > 1 Dell 1950 - dual power supply - 1U > 1 Dell NAS - dual power supply - 2U > > We have the space for the servers. We're only concerned about the UPS > and A/C. I can calculate the UPS needs, although if someone knows of > an online calculator to do this that would be great. > > But the real question is A/C and heat. The goal is to put this into a > rack in a small server closet, along with a VOIP PBX, ASA 5505, > 48-port switch, and aforementioned UPS. > > What are your thoughts on our A/C and airflow needs? How do I > calculate our needs the best? And should we look into a rack/cabinet > that has some type of A/C and airflow solution built into it?
kW in equals kW out (or near enough) for a server room (it does get messier if you have people in there all the time but it works in the general case). Yes, you'll want to get a professional to check it, but you can at least do a back of the envelope calculation by calculating the peak load on the gear and the capability of the airconditioner. e.g. if your servers use 10kW of power, you should have at least 10kW of cooling. You'll get any number of different measuring units out of the aircon guys. Some will give you BTU/hr and some tons (there are others too, but these are the most common). Online calculators are, for the most part, just doing the kW used -> BTU calculation in the background. Life is much less error prone if you get everyone to work in kilowatts. While it's best to size for peak load, you can size for a bit above your normal load to save money. Just be aware of the trade off you're making. Also, now is a good time to plan for any other gear that may end up in that closet in the next 2-5 years. Paul _______________________________________________ Tech mailing list [email protected] https://lists.lopsa.org/cgi-bin/mailman/listinfo/tech This list provided by the League of Professional System Administrators http://lopsa.org/
