I helped build a 'small data center', we put in 3 1MW diesel generators to feed two 1MW APC UPSes, that ran the data center. The AC ran off of the diesel generators and grid power. We ran full time off the APC UPSes, and if the commercial power failed, we automatically brought up all 3 generators. Assuming one would fail, the others could carry the full load. If one did not fail, the one with the longest run time in the logs would be shout down. The UPSes were big enough to run the data center at full load for about 20 minutes, but it should be no more than 60 seconds before we were on generator power if commercial failed, or was out for more than a few moments.
In the old days I worked on IBM mainframes, and a small mainframe (4341 if I remember right) had a generator set to help isolate the power. Internal to that machine the generator set generated 400Hz, but we fed it from our commercial building power into the generator. It was not mechanically efficient, but it kept the machine going. The HVAC was on regular building power. ,,, Even at larger datacenters where I worked, the idea was enough building UPS to keep the computer and networking going. The UPS and building HVAC and a few essential services were powered by the generator sets if commercial power died, and we tried to have power fed from two or more separate sub-stations linked to different parts of the 'grid'. One side on the same 'grid feed' as a local hospital or two if possible ... their power seems to get fixed first :) ... but at the ones where I was, no major fly wheel storage or things like that. ------------------------------------------------------------------------------ Increase Visibility of Your 3D Game App & Earn a Chance To Win $500! Tap into the largest installed PC base & get more eyes on your game by optimizing for Intel(R) Graphics Technology. Get started today with the Intel(R) Software Partner Program. Five $500 cash prizes are up for grabs. http://p.sf.net/sfu/intelisp-dev2dev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
