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Re: HE.net, Fremont-2 outage?
- From: Michael K. Smith
- Date: Wed Nov 04 14:21:43 2009
On 11/4/09 11:44 AM, "Alex Rubenstein" <alex@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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