Nut upsuser - Aug 2006 - Will MGE-UPS Ellipse USBS auto shutdown?

I have an Ellipse USBS connected via serial cable to a CentOS 3 box.

Do I need to turn off the UPS as the final stage of shutdown, or will
the UPS power itself off, before the battery reaches a level to low to
safely recharge from?

I notice there is the option for the UPS to turn itself off (and on
again) unattended if power is restored during shutdown, but there
doesn't seem to be an option to turn it off after a delay if power is
restored.

My goal is to have the system safely shutdown and restart unattended,
as it will be running in an environment where it can't be manually
rebooted.

TIA

Ben

On Saturday 12 August 2006 15:05, Ben wrote:
> I have an Ellipse USBS connected via serial cable to a CentOS 3 box.
>
> Do I need to turn off the UPS as the final stage of shutdown, or will
> the UPS power itself off, before the battery reaches a level to low to
> safely recharge from?
You need to set ondelay and offdelay... Note that ondelay is units of 10 
seconds whereas offdelay is in seconds.

-- 
Daniel O'Connor software and network engineer
for Genesis Software - http://www.gsoft.com.au
"The nice thing about standards is that there
are so many of them to choose from."
  -- Andrew Tanenbaum
GPG Fingerprint - 5596 B766 97C0 0E94 4347 295E E593 DC20 7B3F CE8C
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On 8/13/06, Peter Selinger <selinger@mathstat.dal.ca>
wrote:
> Ben,
>
> Not all UPS hardward and not all drivers support ondelay/offdelay.  In
> any case, you should let your system shutdown script kill the UPS, at
> the very end, after all the disks have been mounted read-only, and
> just before the system is normally halted. This will turn off your
> computer safely. -- Peter
Ok, so if I want to use a UPS for a router, then I need to attach a
computer to the UPS as well, to ensure the UPS shuts down at a certain
point, otherwise the router will continue to use the battery and the
UPS will not deactivate itself before it reaches an unsafe level?

On Sun, Aug 13, 2006 at 11:20:20PM +1000, Ben wrote:
> On 8/13/06, Peter Selinger <selinger@mathstat.dal.ca> wrote:
> >Ben,
> >
> >Not all UPS hardward and not all drivers support ondelay/offdelay.  In
> >any case, you should let your system shutdown script kill the UPS, at
> >the very end, after all the disks have been mounted read-only, and
> >just before the system is normally halted. This will turn off your
> >computer safely. -- Peter
> 
> Ok, so if I want to use a UPS for a router, then I need to attach a
> computer to the UPS as well, to ensure the UPS shuts down at a certain
> point, otherwise the router will continue to use the battery and the
> UPS will not deactivate itself before it reaches an unsafe level?
> 
MGE UPSes shutdown after 120 seconds when low battery condition is met
(when batteries reach 30% by default) and restart automatically after a
few seconds when the power comes back even if no computer is attached.

The computer connection allows to change the default and to warn the
computer of the mains status to allow for safe shutdown.

Philippe

Ben wrote:
> 
> On 8/13/06, Peter Selinger <selinger@mathstat.dal.ca> wrote:
> > Ben,
> >
> > Not all UPS hardward and not all drivers support ondelay/offdelay.  In
> > any case, you should let your system shutdown script kill the UPS, at
> > the very end, after all the disks have been mounted read-only, and
> > just before the system is normally halted. This will turn off your
> > computer safely. -- Peter
> 
> Ok, so if I want to use a UPS for a router, then I need to attach a
> computer to the UPS as well, to ensure the UPS shuts down at a certain
> point, otherwise the router will continue to use the battery and the
> UPS will not deactivate itself before it reaches an unsafe level?
No, because a router does not have a shutdown procedure. Therefore,
there is no "unsafe" way of shutting down a router - you simply unplug
it. In other words, just attach the router to a UPS, and do nothing. 
The UPS will supply power as long as possible, and as soon as
possible, and no driver is required. 

-- Peter