RE: UPS Connection at V5R4

[ChadB@xxxxxxxxxxxxxxxxxxxx]

I do remember IBM support telling me that it was a question of the FSP
finding the cable at power up, but from what you're saying it will still
happen on the new boxes... that's good to know!  I'll be watching for it
next month on our new 525s.



                                                                       
             "Lukas Beeler"                                            
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I can confirm this. Happens on older 520, 520+, 515, and 525. Must have
something to do with the FSP which probably talks to the UPS, not i5/OS
directly.

That's why my procedure described the whole power down/unplug work.

-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx
[mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of
ChadB@xxxxxxxxxxxxxxxxxxxx
Sent: Tuesday, September 04, 2007 10:32 PM
To: Midrange Systems Technical Discussion
Subject: Re: UPS Connection at V5R4


There are (or were at some V5R3 PTF levels) situations where the 520s
will not see the cable being attached/detached unless it was detected at
power up of the box (and on some occasions, we had to actually UNPLUG
the 520).
Don't remember all the details as it's been almost 3 years ago, but
there were definitely some hoops to jump through with these UPS cables.





             James Lampert

             <jamesl@touchtone

             corp.com>
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             09/04/2007 04:10
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             PM                        Re: UPS Connection at V5R4





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Lukas Beeler wrote:
> The only way i found so far to test this was very very stupid (there
> probably is a better one):
>
> Power down the machine. Unplug the power (to power down the FSP).
> Unplug the UPS cable. Power up the machine. You might now see a
> message telling you that an UPS has been disconnected. Power down the
> machine. Unplug the Power. Plugin the UPS cable. Power up the machine.

> Check DSPLOG and QSYSOPR MSGQ for a message telling you that an UPS
was found.

There should be no need to power down the machine to test whether or not
  it can detect connection/disconnection of the UPS cable. We've
connected/disconnected these cables on "live" machines with no problems
whatsoever.

We've even had (and it's in the archives) to add relay boxes to suppress
the "low battery" signal during UPS self-tests, as that signal, combined
with an "on battery power" signal, induces an immediate, unstoppable,
emergency power-down (with the consequence of a rather protracted IPL).
We've also constructed relay boxes to mimic UPS signals purely based on
line power status.

With a chart of the pinouts, and the appropriate breakout box, it should
be possible to simulate any possible combination of UPS signals (but
again, note that some will initiate an emergency power-down, leaving a
large mess to be cleaned up during the next IPL).

--
James H. H. Lampert
Touchtone Corporation

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