Re: Power Handling programs and QPWRRSTIPL

[Larry Bolhuis <lbolhui@xxxxxxx>]

Chris has the right idea here.  Allowing the UPS batteries to fully or nearly
fully drain before shutting down leaves you with your keester out in the wind 
(so
to speak).   It's very rare for a UPS to be expected to run the system for a 
long
time.
Most are designed for three scenarios: 1) To allow for bridging those 3 second
reset timeouts built into the utility grid (and other short drops), 2) To bridge
to the Generator, or 3) To allow an orderly shutdown.

As Al mentioned set QPWRRSTIPL to '1' only when you have reliable power and the
weather is favorable.  If you've never experienced an abnormal powerdown during
an IPL following and abnormal powerdown it's best left to those with more time 
on
their hands!

My standard recommendations for Power Handling programs include things like
Immediate hold of all jobqs as soon as the utility departs (don't start any new
jobs). End all print writers after the current job (Or cancel them if the 
printer
has already failed). Start a new subsystem to acquire all non-signed on 
terminals
which indicates power is down and does not allow signon (Lets the remote guys
know what's happening). And finally send a break message to all active users to
sign-off (again mostly for remote users).    Then when the time comes, do all 
the
rest of the shutdown stuff. (Remember to set a flag that all the jobqs are held
for use in your startup program!)

 - Larry

Chris Bipes wrote:
> 
> I have calculated the duration of the ups batteries and start a controlled
> powerdown 1/2 life of the batteries.  This save the ups batters to handle
> situtations such as you stated.
> 
> -----Original Message-----
> From: Faist, Steve [mailto:stfaist@techcore.net]
> Sent: Friday, December 10, 1999 1:04 PM
> To: 'Midrange-L'
> Subject: Power Handling programs and QPWRRSTIPL
> 
> I'm writing a power handling program to better control the shutdown of
> our system when the power dies and were running on UPS batteries.  I'm a
> little concerned about setting QPWRRSTIPL = 1 (which auto-IPL's the
> system once power is restored).  My concern revolves around the
> following scenario.
> 
> My UPS batteries get fully discharged during a power outage.  Utility
> power then gets restored and an IPL is started automatically.  5 or 10
> minutes into the IPL, power drops once again and, since my UPS batteries
> were just fully discharged, they are of no use and the 400 goes down in
> the middle of an IPL.
> 
> To me, that seems a rather dangerous possibility.  Am I overstating the
> risk or is it an acceptable one.  My initial reaction is for me to set
> up pager software to send an operator a message to come in and manually
> re-start the system when it comes back up??
> 
> Any Thoughts??
> 
> Steve Faist
> TechCore Solutions
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-- 
Larry Bolhuis         | What do You want to Reload today?
Arbor Solutions, Inc  | Don't throw your PC out the window,
(616) 451-2500        |  throw WINDOWS out of your PC.
(616) 451-2571 -fax   | Two rules to success in life:
lbolhui@ibm.net       | 1. Never tell people everything you know.
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