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

[Scott Granados]

You're correct, depending on the hardware you're using your supplies could 
be sucking fibers right n to their inner workings.  I don't recall if you 
mentioned so sorry if this is covering old ground but is it only Cisco gear 
you're having issues with or is it random across platforms / hardware types?

----- 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: Wednesday, September 02, 2009 8:08 AM
Subject: Re: [c-nsp] Multiple power supply failures. Advise needed


> What about the fact that most (if not all) power supplies have independent 
> sucking fan
> and that power supply air flow is separate from the system board flow.
>
> Plus all system board I saw are covered with some insulating coating.
> I've never pulled apart a modern power supply. I'd expect them to have 
> something like that too, but who knows?
> Plus since PSU is the only part that's dealing with high voltages I expect 
> it to be more sensitive
> to momentary shorts. Am I wrong?
>
> I'm expecting report for provider ordered unintrusive power monitoring.
> I'm almost positive they won't find anything, though.
> I'm still looking for advice on independent power analysis source in New 
> York, NY if anyone has this kind of experience.
> Thanks,
>
> Michael
>
> On Wednesday 02 September 2009 10:29:07 am Randy McAnally wrote:
>> Plain old dust wouldn't be so picky...it has to be ingested past the 
>> system
>> board before it hits the power supply in most cases.  System boards are 
>> WAY
>> more sensitive to this kind of thing.
>>
>> The fact you have ONLY PSU's failing still makes me think you have power 
>> issues.
>>
>> --
>> Randy
>> www.FastServ.com
>>
>> ---------- Original Message -----------
>> From: Michael Ulitskiy <mulitskiy at acedsl.com>
>> To: "Randy McAnally" <rsm at fast-serv.com>
>> Cc: "Scott Granados" <gsgranados at comcast.net>, "Seth Mattinen"
>> <sethm at rollernet.us>, cisco-nsp at puck.nether.net
>> Sent: Tue, 1 Sep 2009 23:21:23 -0400
>> Subject: Re: [c-nsp] Multiple power supply failures. Advise needed
>>
>> > This is my main suspect now. They are doing work in the facility.
>> > Not heavy construction, but they do install cages and cabinets for
>> > new tenants and they're definitely using tools that  produce metal 
>> > dust.
>> > My theory is that because of we've been the 1st customer who moved
>> > into that facility we've been collecting that metal dust for longest
>> > and so we're having a lot of problems with our equipment. To my
>> > knowledge none of our neighbors are having the same problem, but
>> > none of them have been in the place long enough. So the question
>> > remains: is there any way to fight it/protect from it except from
>> > going through the huge-huge-huge headache of undertaking another move?
>> >
>> > Michael
>> >
>> > On Tuesday 01 September 2009 08:48:38 pm Randy McAnally wrote:
>> > > He mentioned he was one of the first customers in the colo so
>> > > this might be a possibility
>> > >
>> > > --
>> > > Randy
>> > >
>> > > ---------- Original Message -----------
>> > > From: "Scott Granados" <gsgranados at comcast.net>
>> > > To: "Seth Mattinen" <sethm at rollernet.us>, "Michael Ulitskiy"
>> > > <mulitskiy at acedsl.com>
>> > > Cc: cisco-nsp at puck.nether.net
>> > > Sent: Tue, 1 Sep 2009 17:35:34 -0700
>> > > Subject: Re: [c-nsp] Multiple power supply failures. Advise needed
>> > >
>> > > > Also make sure that the provider isn't doing work in the facility.
>> > > >  I'll never forget going to an L3 datacenter and arriving to find
>> > > > workmen in the overhead grinding away and dropping dust and who
>> > > > knows what else in to all the racks below including a rack of Netra
>> > > > T1's that promptly sucked in the dust and kicked out power
>> > > > supplies.;)  It was definitely metal shavings because they were
>> > > > using a grinding type tool up in  the over head frames.
>> > > >
>> > >
>> > >
>> ------- End of Original Message -------
>>
>>
>
>
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