[ale] PC power supply voltages

[Scott Castaline]

James P. Kinney III wrote:
> On Thu, 2007-02-15 at 22:34 -0500, Jim Popovitch wrote:
>   
>> On Thu, 2007-02-15 at 22:12 -0500, Dow_Hurst wrote:
>>     
>>> Jim,
>>> Can you hear any fan bearings going bad?  Has someone brought in a small heater that is on the same circuit?
>>>       
>> It's in a datacenter downtown, so I can't (yet) hear it  ...and I don't
>> feel like driving down there atm.  However an identical box, right next
>> to this box, isn't having the same issues... so I think the "small
>> heater" issue is out of the question.  The fan speed is different
>> between the two boxes, but neither is out of range of it's average over
>> the past year.  All metrics are in spec, other than the occasional blip
>> on the low voltage power lines.
>>     
>
> I would get a replacement PS in the box ASAP. Start double checking the
> logs for intermittent memory errors and non-fatal kernel faults.
> Over-voltages cause system damage. Under-voltages cause data damage.
>   
>> -Jim P.
>>
>>     
>>> Dow
>>>
>>>
>>> -----Original Message-----
>>>       
>>>> From: Jim Popovitch <jimpop at yahoo.com>
>>>> Sent: Feb 15, 2007 9:35 PM
>>>> To: Atlanta Linux Enthusiasts <ale at ale.org>
>>>> Subject: Re: [ale] PC power supply voltages
>>>>
>>>> On Thu, 2007-02-15 at 20:44 -0500, Scott Castaline wrote:
>>>>         
>>>>> Jim Popovitch wrote:
>>>>>           
>>>>>> I've got a box where lm-sensors shows the +3.3 voltage going up and down
>>>>>> between 3.39 and 3.41.  It jumps to 3.41 every ~1.5 hours and shortly
>>>>>> thereafter drops back to 3.39 (which has been it's normal voltage for
>>>>>> the past year or so).  A second box right near it isn't experiencing
>>>>>> this behavior, which started at 2pm today, and there are no other
>>>>>> indications of any problems.  How concerned should I be?
>>>>>>
>>>>>>             
>>>>> I don't think that it's a problem yet since the fluctuation is within 5% 
>>>>> of it's nominal voltage of 3.3. But it could be an indication of 
>>>>> something is strarting to go, but I've seen older power supplies do that 
>>>>> and last for several months to a couple of years.
>>>>>           
>>>> It gets worse. :-(
>>>>
>>>> -12V is -14.91 (outside range [-10.80:-13.18])
>>>> VBat is 0.03 (outside range [2.40:3.60]) <- WTF is VBat? (it's a server)
>>>> VCore is 1.35 (outside range [1.93:1.93])
>>>> V5SB is 5.16 (outside range [4.86:5.14])
>>>>
>>>>
>>>> -Jim P.
>>>>         
>>> No sig.
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>>>       
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I agree with James. It looks like it's a rapidly deteriorating 
condition. Time to replace the PS.