[c-nsp] Multiple power supply failures. Advise needed

[Michael Ulitskiy]

Please see inline

On Tuesday 01 September 2009 06:17:11 pm you wrote:
> As another person mentioned, your surge suppressor might not be effective
> enough, or perhaps after a couple of surges it was rendered useless.
> 
> If you can afford the financial hit, I'd get some large online UPS's for your
> equipment that will effectively isolate you from their power.

That's out of the question. Besides, there's no reason to pay rent in telco-grade colo-facility
that have those large UPSes and backup generator in place if I have to maintain my own UPSes.
 
> Although you didn't mention it specifically, are you 100% sure operating temps
> in your cabinet are sane?

That's about the only thing I'm more or less sure about. This is not a cabinet, but an open cage
with 6 open racks installed. The place is cool and I haven't seen a single environmental alarm
from any cisco device or server sensor.

> --
> Randy
> 
> ---------- Original Message -----------
> From: Michael Ulitskiy <mulitskiy at acedsl.com>
> To: "Randy McAnally" <rsm at fast-serv.com>
> Cc: cisco-nsp at puck.nether.net
> Sent: Tue, 1 Sep 2009 17:27:00 -0400
> Subject: Re: [c-nsp] Multiple power supply failures. Advise needed
> 
> > Unless they vaporized by the short.
> > Unfortunately I don't have those supplies anymore. They're either in 
> > the garbage or shipped back to vendor for replacement. In any case 
> > it would let me make certain about the reason for the failures at 
> > most (which is sure very important), but the important question is 
> > what can I do to stop it. I'm still at loss...
> > 
> > Michael
> > 
> > On Tuesday 01 September 2009 04:59:40 pm Randy McAnally wrote:
> > > You could pull apart a blown supply and look for them.  According to the wiki
> > > they should be somewhat visible, at least with a magnifying glass.
> > > 
> > > --
> > > Randy
> > > 
> > > ---------- Original Message -----------
> > > From: Michael Ulitskiy <mulitskiy at acedsl.com>
> > > To: cisco-nsp at puck.nether.net
> > > Sent: Tue, 1 Sep 2009 16:35:49 -0400
> > > Subject: Re: [c-nsp] Multiple power supply failures. Advise needed
> > > 
> > > > Well, I find the idea with whiskers particularly interesting,
> > > >  because a lot of things described are perfectly matched with my situation.
> > > > We did recently moved, the data-center does have tiled raised floor 
> > > > (don't know if it zinced though) and the airflow is bottom to top 
> > > > which probably helps to bring conductive particles like metal dust 
> > > > up to the server level where it can be sucked by the power supply 
> > > > fan. The place is new and we've been the first to occupy it, so we 
> > > > have the longest exposure and if this theory is true we should be 
> > > > the most affected and we are.
> > > > 
> > > > Now I've spent last hour googling and I can't see what I can do to 
> > > > help it. Any suggestions?
> > > > 
> > > > Michael
> > > > 
> > > > On Tuesday 01 September 2009 02:29:21 pm Mark Kent wrote:
> > > > > >> Check out http://en.wikipedia.org/wiki/Zinc_whiskers and Google for
> > > > > >> "zinc whiskers".
> > > > > 
> > > > > Or, just as useful to you, check out new-ish research results:
> > > > > 
> > > > >   http://blogs.physicstoday.org/update/2009/05/how-tin-whiskers-grow.html
> > > > > 
> > > > > Note that it is in-plane strain *gradients* that lead to the whisker
> > > > > growth.  If you were previously working on the strains themselves then
> > > > > this may be the big break you were looking for.
> > > > > 
> > > > > -mark
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> > > > >
> > > > 
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> > > ------- End of Original Message -------
> > > 
> > >
> ------- End of Original Message -------
> 
>