We are trying to determine the right power and cooling for a new server room which would be about 350 sq ft., our power is 220V. We are initially only planning to start with a single rack with potential of expanding upto 4 or 6. The rack would have 10-12 Dell Poweredge 630/730 1U servers with 2 Cisco 3850 switches and a PS6200 series Equallogic SAN. I've read several different sources and discussion boards and a lot of it becomes confusing. Some people say never to go with the nameplate power rating of a device, others say that's what your device can draw maximum so that should be used, etc. Another aspect I read was about power per rack which seemed to be a good estimation approach. It stated low density racks are about 4-5kW, medium density about 8-10kW and high density about 12-15kW, does this sound right? Looking at the Dell servers, it shows 3 different types of power supplies: 495 W, 750 W, or 1100 W. Most places I read suggested 300 watts per server. The dell PS6210 SAN lists 1080W and the cisco switch power supplies range from 350W to 1100W
I've tried to do some calculation and came to about 4kW (300W x 12 and rounding up) for servers, another 3.3kW for the 2 switches and the SAN unit, so roughly 7.5kW for the rack, does this estimate seem right? Based on only 10-12 1U servers I was thinking its a low density configuration and should be about 4-5kW.
For cooling should I just multiply this by 6 (for 6 potential racks) and convert that to tons or BTU ? That would actually mean 7.5kW x 6 = 45kW which is about 12.7 tons of cooling, that can't be right for such a small server room.
I've also gone through APC's UPS calculating tool which showed me only 750-1000VA models that would be able to provide UPS to one rack. There are also 2 whitepapers by APC which I'm currently trying to read and understand properly.
Any help/suggestions would be greatly appreciated. Thanks