dbuckley wrote:
The power reliability requirements for data centres are pretty harsh, I'd put it as 24x7x20 years, and the simple fact is that very very few facilities are able to deliver that degree of reliability, they are much worse. Most facilities have had or will have a power drop.
The nearest you can get to reliable power using single power cord computers is to use a
Cyberex rack mount static switch, and feed it from two different PDUs on different supply systems. Not cheap, but cost effective.
trouble is, most facilities networking takes a dive when the power goes.....
I totally agree. I've worked in data centres with duel 1.5 Gigawatt generators, and a load of battery backup. These sites had less stable power than my home mains connection. I've seen generators ( that are regularity tested ) fail, the electrical switching equipment fail, the relays jam onto generator power so that you can't switch back to mains without powering down the entire site..
People make all sorts of crazy promises, but the simple fact is this stuff doesn't work very well even if it's all loaded well within spec and tested often.
Having said that if people fail to meet SLA's they deserve to lose business. If they agree to something then can't do it they either didn't know the implications what they agreed to or didn't care.
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) - I have a TP box with a 437 day uptime and one on 144 days.