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From - Thu Sep 13 07:40:34 2001
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From: "Brian K. White" <brian@aljex.com>
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Subject: Re: Unix 5.0 in panic
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My Unix and Linux Troubleshooting E-Book will show you how to solve tough system problems!




"Karel Adams" <k_adams@glo.be> wrote in message
news:klRn7.5782$35.573711@iguano.antw.online.be...
>
> "Erik Kurz" <ek@beta.at> schreef in bericht
news:9nn8mb$mrn$1@murmel.gams.at...
> >
> > "Karel Adams" <k_adams@glo.be> schrieb im Newsbeitrag
> > news:Myrn7.5749$35.567026@iguano.antw.online.be...
> > >
> > > "Erik Kurz" <ek@beta.at> schreef in bericht
> > news:9nl191$lhr$1@murmel.gams.at...
> > > > Hi there,
> > > > unix stopped using following message:
> > > > unexpected trap in kernel mode:
> > > > PANIC: k_trap - kernel mode trap type 0x00000160
> > > > trying to dump 16287 pages to dumpdev hd (1/41) at block 0, 204
pages
> > per
> > > > '.'
> > > > has anyone an idea an can help me ?
> > > > i'm a novice user!
> > >
> > > And you will the answer that many novices got here:
> > > Please do give as _much_ more information!!!
> > >
> > > Some people will require exact version (output of uname -X)
> > > and patchlevel (customquery listpatches | head -1)
> > >
> > > For myself, I should at the very least like to know
> > > -) if this is a newly installed machine that you
> > > find no way to boot, or whether a server that's worked
> > > for years without trouble and now suddenly dies on you
> > > -) if you have been able to get it back to working
> > > and if so, what you could read in /var/adm/syslog
> > > and /var/adm/messages
> > >
> > > Remember: the more you say, the better the answers you may get!
> > >
> > > Gr��e!
> > > Karel
> > >
> > >
> > here is some info
> >
> > +)the server is working for years without troubles
>
> Well with any luck it ought to add many more!
>
> > +)version: Release 3.2v5.0.0
> >              KernelID 95/08/08
>
> That it rather old, not to say very old!
>
> > +)patchlevel:  SCO:Tcl::7.3.2a  oss 603a.TclX732a
>
> And this seams meagre. There must be a website
> that tells you a minimum patch level but I am afraid
> it will be a very long list for this old release.
>
> > +)syslog: no entry with the current date  (file is to big to show info)
>
> Your pardon? ('''Bitte?''') At the very least 'tail' should yield some
info.
> Beyond that, vi has never failed me for the size of the file
> I made it handle - I often used it on files of at least 10MB size!
>
> > +)messages: no entry with the current date
> >
> > +) i powered off the server and started it again, after that
> >      i did an orderly shutdown (reboot)
>
> This seems wise.
>
> >     at the moment it is working
>
> Well that's the main thing, isn't it?
>
> Finally: to my (limited) experience, this kind of trouble
> is very hard to diagnosticize. If it doesn't come back
> within a month of continuous operation, just forget it.
> If it does, I think you ought to suspect hardware, and
> start by swapping step for step, starting with memory
> (easiest and cheapest), next CPU, next motherboard.














while the memory might be the easiest and cheapest thing to replace, it is
among the least likely to change with age. The most likely peice of hardware
to look at for random problems after years of no problems, (barring the
obvious, cpu and powersupply fans) is the power supply.



if the power supply doesn't fix it, then all other components are about
equally likely, but I'd start with the motherboard (it has capacitors that
change value with age, as do some other components, but a dead cdrom drive
generally doesn't affect the rest of the system)



One thing I've seen, if the motherboard is old, try upping the voltage on
the cpu by 1 or 2 tenths of a volt. I have seen this work. I don't know
which of two most probable reasons it works. maybe a) the chip is "old" and
has changed inside, and now needs a higher voltage to work reliably.  or
maybe b) the motherboard is "old" and when you set the jumpers for say, 2.9
volts, it's no longer actually delivering that, so you need to set it to
say, 3.1, to get 2.9. Either way, if this seems to fix the problem, do 2
things immediately. 1) install a new, oversized cpu fan and heat sink, and
use heatsink grease and remove any stickers or other foreign objects between
the cpu face and the heat sink. 2) tell the owner of the computer to be
ready to replace the server because this only buys you some time, it cannot
be considered a real fix.

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Another thing I've seen more than once: scsi ribbon cables that touch metal,
where the insulation has worn away and the wire inside is just barely
visible, meaning it sometimes but not always gets shorted to the chassis
ground. You have to look close and careful for that, not just near sharp
corners either. Systems run mostly ok, but get a random corrupted file here
and there and messages in the log file and sometimes momentary server lockup
or even unexpected reboot. Basically, If you see symptoms that make you
think "hard drive is going south", look hard at the cable first.



--
Brian K. White  --  brian@aljex.com  --  http://www.aljex.com/bkw/
+++++[>+++[>+++++>+++++++<<-]<-]>>+.>.+++++.+++++++.-.[>+<---]>++.
filePro BBx  Linux SCO  Prosper/FACTS AutoCAD  #callahans Satriani




















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