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

[Seth Mattinen]

Michael Ulitskiy wrote:
> On Tuesday 01 September 2009 07:26:27 pm you wrote:
>  
>> Something really odd/fishy is going on at the facility in question.
>> Either they have a problem and won't admit it, or they're just as
>> baffled as you are. But there is obviously *something* very bad going on
>> to fry power supplies like that.
>>
>> Which leads me to a question; has any of the stuff you've replaced
>> become part of the fried PSU problem, or just originally installed
>> supplies? One tells me they're lying and the power is even worse than a
>> raw utility feed, the other says maybe you have metal particles (or
>> something) building up from under the raised floor over time.
> 
> Out of the 7 failed PSUs 6 was original equipment. One cisco gear (AS5400) has power supply failed twice.
> The 2nd failed power supply had been in service like 24-48 hours only before the failure, so may be it was just bad
> power supply. I'm leaning toward metal particles build up as a most plausible theory at the point. 
> I just don't know how to deal with the problem...
> 

Yeah, metal dust would be a killer. I don't know what to say either;
magnetic air filters? Maybe salvage/buy some powerful magnets and mount
them in your airflow. See if they collect anything over time. If they
do, at least you'll have evidence.

~Seth