Re: network shutdown and UPS

From: Roger Abell (mvpNOSpam_at_asu.edu)
Date: 11/28/03 

Date: Thu, 27 Nov 2003 19:07:07 -0700

"Shenan T. Stanley" <news_helper@hushmail.com> wrote in message
news:OY0Gu7UtDHA.540@tk2msftngp13.phx.gbl...
> -- Original Post ---
> > i heard about a function of xp that shuts down all
> > computers belonging to a network in case of energy loss.
> > i have a central ups connected to one unit, in case of
> > energy loss, i want all the other network computers also
> > to shut down without using a ups for every single
> > computer.
> > DOES XP SUPPORT THIS?
>
> Shenan Stanley <> wrote:
> > Let me help you out here....
> > In case of energy loss, you want one computer with the SOLE UPS
> > unit to shut down all other computers?
> > Think about that. If the other computers do NOT have a UPS, they
> > will be OFF - there is no power to them. Therefore you cannot send
> > them a signal to tell them to shut down. Also, it is likely that
> > you have no NETWORK whenever the power goes off unless your
> > switch/hub is also battery-backed up.
>
> killme <> wrote:
> > I'd be interested in this if there were such a feature. Instead of a
> > UPS for every computer you could have a UPS for every 2 or 3
> > computers. But I've never heard of such a feature.
>
> Roger Abell <> wrote:
> > Some UPS has ability to use the network.
> > On the machine with the UPS attached the software
> > that comes with the UPS is set to send the signal
> > and the same software installed on the other machines
> > is set to listen for the signal.
> > Other UPS software allows you to specify something
> > that should be run. In this case you could run a script
> > that issues a shutdown command to the other machines.
>
> Yes - most good UPS software does come with this "feature" - however, in
the
> case that there is only one UPS hooked to one of the machines (and if
there
> is none hooked to the networking equipment) - it is worthless when the
power
> goes off. Now if you have your Network Hub/Switch on a UPS, each of your
> other machines on a UPS and you are using a protocol that would keep you
> from losing contact with your other machines when the power goes off - you
> should be fine with using this application. But if you have a normal
(home)
> setup where the Network Hub/Switch (if you have one) is not battery
> back-up'ed and/or you get your IP from the cable/dsl modem through DHCP -
> there is a DISTINCT possibility you will have NO way of issuing these
> commands. It is a great idea, but only if you think it through. =)
>
> --
> Shenan Stanley
> "Just trying to help"
>

I take the mention of "UPS hooked up to" to mean
the serial or usb signal connection, and not to mean
"plugged into". IOW I assumed they were keeping
the equipment powered (network included), and
were asking how to gracefully shut it down when
only one machine was being signaled.

Of course you are right that something that is not
running cannot be shut down (in fact I found your
initial post humorously polite). 

-- 
Roger Abell
Microsoft MVP (Windows Server System: Security)
MCSE (W2k3,W2k,Nt4)  MCDBA

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