Re: [Fwd: Continued alpha hanging]

["Calvin Coghlan" <CCoghlan dc-is org>]

On the topic of UPS's:  Not to say that your problem is the incoming power,  but most people I have ran into do not understand that most UPS do not condition the power.  Backup UPS do not condition the power when drawing from the utility.  Only when you are on battery do you get a cleaned power.  Some of them boost the power when there is a sag (brown out) but it is not conditioned.  Only true on-line UPS condition the power that is only because of the nature of their design.  If you have the equipment and know what you are doing(!) you can check the quality of your power.

You said the machine that is your example is on a on-line UPS so the quality of the power coming out of it should be good.  However,  there is also the condition in which the equipment you have plugged in could be causing the power to become dirty, unless you have isolation.

Calvin.

>>> Greg Johnson <gjohnson@physics.clarku.edu> 10/17/99 09:37PM >>>
On Sun, Oct 17, 1999 at 01:13:45PM -0500, Wes Bauske wrote:
> Greg Johnson wrote:
> > 
> > > If they are on UPS's you should be OK, assuming the UPS
> > > works. Marginal power can make good HW look like it's
> > > flakey. Also, is your power supply in the case a high
> > > output one or a standard power supply? I believe my 164LX
> > > uses a larger than normal power supply. Without popping
> > > the cover, I guess at least 300w, probably 400w.
> > >
> > >
> > > Wes
> > 
> > The machines are from DCG.  They say it's:
> > 
> > Axxion DL-17 Midtower Case w/Extra Cooling
> > Fan and 300W Power Supply
> > 
> > Should be fine, no?
> > 
> 
> That's interesting. I have a PC164 with what looks like the
> same case. It too occasionally would just stop and nothing
> would respond. It wasn't very often though, less than once 
> a month. It's powered off at the moment since I have UPS power
> constraints. I looked at the 164LX user manual and it says 
> you need: +3.3v/5,0A, +5v/14A, -5v/0A, +12v/1A, -12v/.1A, 
> 100W power dissipation for a 600MHZ board, without any other stuff. 
> I bought my 164LX from Microway and it is in a full tower case.
> 
> If I have time today, I'll pop the covers and compare the
> power supply ratings, assuming they have stickers on them.
> 
> 
> Wes

The bigger problem I have is that it seems to be an intermittent
problem.  My uptime at the moment it 6 days.  So far it seems to be
fine.  It seems like hangs are sort of clustered, i.e. I get several,
then none for a while.  I guess I could try building a modular kernel
again and see if it's still reproducible.  The only thing is that I'm
tired of rebooting my machine.  I guess I'll try a modular kernel
tomorrow.

Maybe I'll check the output of the PS for good measure.

Greg

-- 
Greg Johnson                          gjohnson@physics.clarku.edu 
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