[ale] PC power supply voltages

[Jerry Yu]

James, that's very informative. Do you have a link or article that
elaborates on this voltage vs. system/data integrity relationship?

On 2/16/07, James P. Kinney III <jkinney at localnetsolutions.com> 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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> --
> James P. Kinney III
> CEO & Director of Engineering
> Local Net Solutions,LLC
> 770-493-8244
> http://www.localnetsolutions.com
>
> GPG ID: 829C6CA7 James P. Kinney III (M.S. Physics)
> <jkinney at localnetsolutions.com>
> Fingerprint = 3C9E 6366 54FC A3FE BA4D 0659 6190 ADC3 829C 6CA7
>
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