HE.net, Fremont-2 outage?

Michael K. Smith mksmith at adhost.com
Wed Nov 4 12:21:37 CST 2009



On 11/4/09 11:44 AM, "Alex Rubenstein" <alex at corp.nac.net> wrote:

>>> Regardless of generator sizing issues or disparities, if the ATS fails,
>>> then no amount of grid or generator power will keep the cabinets juiced up.
> 
> That is patently false.
>
At it's root it's true - if an ATS fails the power between the source and
destination will be interrupted.
 
> Assume N+1 UPS, with each UPS module having its own ATS fed from a utility and
> emergency bus. Then you can even individually maintain each UPS module and
> ATS. Bonus and score.
> 
> And if it's a really good place, you have two of the above (2(n+1)) and each
> of your power cords goes to one each.
> 
Which doesn't address the failure of one piece of equipment.  Of course, if
you're dual chorded from your server through fully redundant switch gear to
multiple, diverse vaults then a single ATS failure shouldn't affect you.

Regards,

Mike





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