[33308] in North American Network Operators' Group
Re: Operate until failure
daemon@ATHENA.MIT.EDU (David Lesher)
Mon Jan 8 18:23:35 2001
From: David Lesher <wb8foz@nrk.com>
Message-Id: <200101082311.SAA15124@sigma.nrk.com>
To: nanog@merit.edu (nanog list)
Date: Mon, 8 Jan 2001 18:11:20 -0500 (EST)
In-Reply-To: <20010108223549.28492.cpmta@c004.sfo.cp.net> from "Sean Donelan" at Jan 08, 2001 02:35:49 PM
Reply-To: wb8foz@nrk.com
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Unnamed Administration sources reported that Sean Donelan said:
>
>
> And what if you are not using APCs?
See the menu of systems listed at:
http://www.exploits.org/nut/
> One issue with highly redudandent data centers is the failure modes are
> "interesting." You don't want to shutdown due to a single UPS failure, so
> you don't use something simple like PowerChute Plus. You most likely don't
> want to shutdown based on any automatic signal. However, you do want a way
> for an operator to gracefully shutdown a lot of equipment quickly when
> the decision is made.
>
> For a server farm, with potentially thousands of individual systems, is
> there any standard piece of software you can install on all of the systems
> to act as a receiver of a signal to begin a graceful shutdown that does
> not depend on a vendor's proprietary interface? Preferabally one which
> does not involve running a lot of additional wires.
Good point; you'll likely need a box just to talk to UPSi and
control shutdowns. That alas, is adding a single point of failure.
> Again this is only needed if people want a gracefull shutdown. If
> you can live with a hard shutdown, you wouldn't require this. If you
> use ctrl-alt-del as a normal management practice, I suspect you don't
> really require a graceful shutdown.
You really don't want to run all the UPS batteries flat. It will
lengthen the recovery time.... (If graceful shutdown is your goal;
when power is restored, you want the UPS to FIRST recharge enough
so it can again gracefully shutdown, when the power turns out to
be back up for just a minute or two....thus you delay restarting
the load.)
--
A host is a host from coast to coast.................wb8foz@nrk.com
& no one will talk to a host that's close........[v].(301) 56-LINUX
Unless the host (that isn't close).........................pob 1433
is busy, hung or dead....................................20915-1433
