165 Halsey recurring power issues

Mon Oct 23 22:33:38 UTC 2023

I toured The Planet years ago in Dallas and was told by the sales rep 
that A+B power was two circuits from the same PDU. :)

I consider A+B power to be two distinct feeds, separate utility 
entrances, separate generators, separate UPS', PDU's, etc.  Past that I 
consider things like firewall separation, rated chases and such to be 
customer specific requirements.

Aaron

On 10/23/2023 9:38 AM, Babak Pasdar wrote:
> Hello,
>
> I wanted to get some feedback as to what is considered standard A/B 
> power setup when data centers sell redundant power.  It has always 
> been my understanding that A/B power means individually unique and 
> preferably alternate path connections to disparate UPS units.
>
> A few months ago, 165 Halsey took us down for several hours. They 
> claimed that a UPS failed causing this issue.  Our natural reaction 
> was that we have A/B redundant power so a failed UPS on the A circuit 
> should not take down the cabinet. Joe the facility manager claimed 
> that industry standard A/B power means two circuits to the same UPS, 
> which makes no sense to me.
>
> They committed to move us to A/B power with redundant circuits to 
> disparate UPS units.  However, we had a multi-hour outage again in 
> that site this weekend. At first glance it seems to be the same problem.
>
> We have checked with all of our other data center providers who have 
> confirmed A/B power is in fact individually unique connections to 
> disparate UPS units. 165 Halsey's definition of what constitutes 
> redundant power seems unique. Why would anyone pay extra for a second 
> connection to the same UPS?  However, I wanted to get feedback to see 
> if I am taking crazy pills here 🙂
>
> None-the-less, we have lost all confidence in this facility.
>
> Best Regards,
>
> Babak