> > On Thu, Jul 15, 2010 at 7:57 PM, Luke S Crawford <l...@prgmr.com> wrote: > >> so here is the problem: I am exploring the idea of getting >> back into the co-location business. Now, for this to work for me >> and my market, it's got to fit several things. >> >> 1. It's got to be cheap. There is a place for selling expensive >> co-lo... but my entire business is built around selling less expensive >> stuff to people willing to skimp on certain features (and on skimping on >> the right features for that group.) >> >> this means I probably want to sell half-racks, or even quarter racks. >> >> 2. it's got to be low-calorie on my part. if I've got to go re-negotiate >> with a customer every time they exceed their power allowance, or argue >> about if 75% or 85% utilization is acceptable, I'm going to want to charge >> more than my market is willing to bear. Negotiation is fine in many >> markets, but in my market, it would raise costs an unacceptable amount. >> >> 3. there has to be good isolation. It's fine if there are sharp edges; >> my customers are willing to tolerate it if it's easy for them to break their >> own stuff. But if their neighbor's mistakes or my mistakes take them down? >> that is not acceptable. >> >> So, here is what I was thinking. what if I split every 15a circuit into >> two 7.5a circuits. put a breaker on each that blew at 7.5 amps. >> the idea is to make things 'fire and forget' - if you exceed 7.5 amps, >> well, your shit breaks. No negotiation. >> >> (this also removes the possibility of me or one of my people 'going easy' on >> one customer eating more than their share for a few days and then the >> other customer sharing that circuit suddenly having a spike and killing off >> both users.) >> >> Anyhow, uh, is anyone else doing this? is it an absolutely stupid idea? >> should I go looking for a PDU that simulates this behavior? or writing >> a perl script hitting a PDU to simulate this? or is it better to have an >> electrician wire such a thing up with real breakers. would such a thing >> even be possible? (I mean, ultimately, I'd like a breaker that goes >> at 3.75amps, 4 to the 15 amp circuit.) >> ______________________________________________ >> Don't forget that a 15A circuit only gives you 12A. Expect it to blow if you use more than that for some amount of time on a slow blow fuse/circuit.
Cutting power is kind of draconian. Why not just have a penalty fee? With a smart monitoring strip and thresholds, you can charge a premium if they use more than their alotment. Limit to 3 customers per circuit at 4A each. Also, run 208VAC so you have more headroom and you won't see things blowing. Put it in your TOC that all equipment must be capable of running at 208V. There are so few things that don't anymore... (old modems with power bricks come to mind). You'll save a few bucks on your electric by running at the higher voltage, too. _______________________________________________ Tech mailing list Tech@lopsa.org http://lopsa.org/cgi-bin/mailman/listinfo/tech This list provided by the League of Professional System Administrators http://lopsa.org/
