The amount of time it would take to safely shut down the system with a pwrdwnsys restart(*no) is totally dependent on a number of factors. What model of system is it? What processor feature does it have? And more importantly, how many and what kind of jobs do you have running on it? A system that is running a mirroring product like Mimix takes longer to shut down safely than one that doesn't.
As for how long your UPS can sustain the system will depend on the age of the batteries, their capacity and how much power the system draws from it, in addition to other factors. In short, there is no way to give an accurate answer for your specific situation. You will need to conduct testing for your own environment. Your monitor program will need to tell the system when to power off. It's powered off when the power light changes status (solid to blinking).
Mark Clanton
-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Jim Hawkins
Sent: Friday, July 28, 2017 9:17 AM
To: midrange-l@xxxxxxxxxxxx
Subject: How long does a PWRDWNSYS restart(*no) actually take?
I have been tasked to write a program to monitor the UPS on our IBM power system. I found a good base program-so that is all good. We have a generator that is supposed to kick in within the 1st minute of a power failure. My question is more of "what if the generator fails?" From my research, it appears that the ups on the system will last for about 20 minutes.
We do an IPL each week (pwrdwnsys *immed restart(*yes)), (it is what it is, I'm not rocking the boat on this one, so save your breath). What I see in the log is entries indicating: this ended, that ended, etc. for about a minute and a half, then nothing for 32 minutes when I see "Unattended IPL in
progress".
If the generator fails, I want to power down the system, but I am not sure how much time I have to wait. The last time we did a pwrdwnsys restart(*no) was 3 years ago when we had to replace the cache battery-and I don't recall that far back (lol).
I want the system to power down on my terms, not the terms of the UPS. So, good folks, how much time do I really have to power down, before my UPS runs out of batteries? (Yes, I will allocate a little extra for the unexpected and the fact the batteries are 7+ years old.) Just simply, at what point is the system powered off?
(I will be away from my email from noon today until next week)
TIA
Jim Hawkins
Programmer Analyst
Interkal LLC
Kalamazoo, MI
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