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41. Re: Steam Downtime [Updated] Feb 13, 2012, 08:55 Minuit
 
ViRGE wrote on Feb 12, 2012, 23:57:
If the UPS fails, nothing gets power. The UPS is fed by multiple sources, but that UPS is going to be the only source of power for the devices connected to it.

That's why datacentre equipment usually has two plugs. One is for the UPS and the other is for either unconditioned power or a second UPS.

It doesn't do you any good at all if someone thoughtfully plugs the first UPS into the second one, or puts all of the servers on one UPS and all the switches on the second, but as long as someone does their job right this can keep a UPS fault from taking down your entire environment.

The solution to single points of failure is to make them redundant, not to add more of them.
 
 
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