North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: Fog Bank in a co-locate
I'll pass these specs along. I appreciate your comments about negotiation with the colo provider...but seeing as I *am* the colo provider, my perspective is that there is very little window for negotiation... Either I provide your spec or I don't. I haven't found it difficult to meet specifications such as these and enter into SLA for them. I expect all of you to hit me pretty hard on these sorts of things, so the more input now the better. -J > Donelan's Climate Settings: > 8,500 BTU/hr heat dissipation per full rack > Not all of it must be installed on day 1, but I want to > see pre-planning how the HVAC will be expanded to meet > the load (e.g. enough room reserved, aisles wide enough, > to bring in additional units later, pre-plumbed for the > outside heat exchangers, compressors, etc). > Minimum 1 air change per hour > This is actually a 'clue-check' question. How the co-locate > operator answers it will tell you if they really know their > HVAC systems. Unoccupied areas can get by with as little > as 1 air change per 24 hours, but if you are doing an install > or other work in the area, you'll appreciate more frequent > air changes. > Humidity: 35% to 50% R.H., non-condensing, max 2% change per hour > Ideal: 40%-45% R.H., measured at three locations with max 5% > variation. Humidity is expensive to control, so it is > common to have R.H. at the high end of the range (e.g. > 45% R.H.) in areas naturally more humid (e.g. northeast) > and R.H. at the low end of the range (e.g. 40% R.H.) in > areas naturally drier (e.g. southwest). > Maximum (not to exceed 24 hours/annually): 20%-60% R.H., > non-condensing > Temperature: 59f to 77f (15c to 25c), max 4f (2c) change per hour > Ideal: 72f (22c) at my rack, but since it is econmically infeasible > to control the temperature at the rack level, I normally > ask for 68f (20c) as a room average, measured at three > different points, with a maximum of 4f(2c) variation. > The assumption is at worst I'll end up with 72f(22c) at > my rack. Anything much colder than 68f(20c) is a bit > harsh on humans that need to work in the area. A tech > thinking about how cold he is, isn't thinking carefully > enough about the job he is supposed to be doing. > Maximum (not to exceed 24 hours/annually): 49f(10c) to 85f(30c) > > You'll notice I tend to be metric-centric in my measurements. These are > much stricter than your typical C.O. environments. > > Its more a practical matter of negotiating with the co-locate operator, > and asking for more than you really need on the assumption even if they > deliver just 50% of what they promise it won't be an immediate disaster. > They may have no problem delivering 68f(20c) when the co-locate is 90% > empty. But when it fills up, I'm betting with the lower the starting point, > the less likely I'll run into my upper limit. > > I choose most of the values to give myself enough of a buffer before > exceeding any equipment parameters, so I can try to negotiate a resolution > with the co-locate operator before the levels start to causing equipment > to shutdown. Otherwise if you set the limits at the maximum your equipment > will tolerate, a co-locate operator may not do anything until after the > temperature goes over 104f(40c), but by then its too late. Obviously the > co-locate operator wants to write the contract with the largest acceptable > environmental ranges possible, and the co-locate lessee wants the > narrowest acceptable environmental ranges. Its a barginning point, how > much do you really want to pay for +- 1 degree, or +- 10 degrees. > > In reality, most modern electronic equipment will operate well in a wide > range of human-habitable enviroments, as long as the enviroment is stable. > Its the oscillations that will kill your equipment every time. And in most > cases, if the price is the same, I am willing to trade a particular value > for tighter tolerances, e.g. 75f+-1f. But the price is rarely the same, > so I generally choose the bigger range as shown above. > -- > Sean Donelan, Data Research Associates, Inc, St. Louis, MO > Affiliation given for identification not representation > --- [ Jay Adelson [email protected] ] [ Chief Technology Officer Work: +1-650-813-9031 ] [ EQUINIX, Inc., Palo Alto, CA Fax: +1-650-858-8368 ]
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