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

[Randy McAnally]

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.

Although you didn't mention it specifically, are you 100% sure operating temps
in your cabinet are sane?

--
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 -------