[AusNOG] Question about hardware spec for a DC

[Perrin Richardson]

I guess you'll want to be conscious of whether your DC provider allows ATSs. I can't help but thinking I've heard one or two don't locally 

Perrin 

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Please excuse shorter messages

> On 24/04/2014, at 7:37 pm, Bob Purdon <bobp at purdon.id.au> wrote:
> 
>> On 24/04/2014 12:09 PM, Tony de Francesco wrote:
>> Something I did learn from looking at aftermarket auto transfer switches
>> is that not all of them can handle two power feeds that are not
>> synchronised (whether that is a potential issue for your site of not?).
> 
> Even those that do, at least the ones I've seen, will enforce a short break during the switch (for good reason).  Usually short enough that most PSU's don't complain.
> 
> You want your A & B feeds to the rack to be on the same power phase if you're using a transfer switch.  Ultimately the A & B feeds will come together somewhere (that may be in the facility, or within the city power grid), and as a result, they will be in sync.
> 
> They can drift out of sync for various amounts of time during various failure scenarios though.
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