Absolutely true but with widely different power sources in his situation the consequences are not likely to be known.

One additional consideration in his case though is surge suppression. We had a customer who set up they way he suggested and got hit by lightning. The UPS got smoked but everything behind it was OK. Their Power5 though as had 'one foot in the water' by being connected to the wall so it got fried.

The lighting hit was very direct and smoked so much stuff they blew past their insurance cap so they tried to get IBM to repair the machine under maintenance. However if IBM can show burn marks inside the machine they point you back to insurance. There were indeed burn marks inside the machine, scorch marks even!

- Larry "DrFranken" Bolhuis

www.Frankeni.com
www.iDevCloud.com - Personal Development IBM i timeshare service.
www.iInTheCloud.com - Commercial IBM i Cloud Hosting.

On 8/1/2017 10:05 AM, Mark Murphy/STAR BASE Consulting Inc. wrote:
Wouldn't this be a similar situation in the case any time you have redundant power supplies and one side does not have the capacity to supply full load? I don't think that is unique to Justin's configuration.

Mark Murphy
Atlas Data Systems
mmurphy@xxxxxxxxxxxxxxx


-----DrFranken <midrange@xxxxxxxxxxxx> wrote: -----
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxx>, Justin Taylor <JUSTIN@xxxxxxxxxxxxx>
From: DrFranken <midrange@xxxxxxxxxxxx>
Date: 07/31/2017 04:45PM
Subject: Re: How long does a PWRDWNSYS restart(*no) actually take?


But if a power supply fails and it's the one on the UPS then the load on
the wall outlet doubles. If that wasn't planned for then TRIP and down
you go anyway. Also the same problem when the UPS Failes as the load
swings to the wall outlet.

Likewise if the power supply fails that's on the wall outlet. The load
on the UPS now doubles. Again if not planned for TRIP and down you go.

You may be figuring out that this is not my favorite configuration. :-)

- Larry "DrFranken" Bolhuis

www.Frankeni.com
www.iDevCloud.com - Personal Development IBM i timeshare service.
www.iInTheCloud.com - Commercial IBM i Cloud Hosting.

On 7/31/2017 4:27 PM, Justin Taylor wrote:
On first glance, that sounds like a good idea (although not straight into dirty power).

If a power supply fails, you're still good.
If utility power fails, you're still good.
If UPS fails, you're still good.**

** If both power supplies go into the UPS, you're sunk here.



-----Original Message-----
From: DrFranken [mailto:midrange@xxxxxxxxxxxx]
Sent: Monday, July 31, 2017 2:37 PM
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxx>; Gerald Magnuson <gmagqcy.midrange@xxxxxxxxx>
Subject: Re: How long does a PWRDWNSYS restart(*no) actually take?

> We do have redundant power supplies, and I have them honed to 1) > straight Utility power... 2) UPS (after the utility power / > Generator switch)....

Curious to the logic of plugging one into the wall and one into the UPS?

- Larry "DrFranken" Bolhuis

www.Frankeni.com
www.iDevCloud.com - Personal Development IBM i timeshare service.
www.iInTheCloud.com - Commercial IBM i Cloud Hosting.



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