On Wed, May 12, 1999 at 11:04:37AM +0200, Francisco Jose Montilla wrote:
> On Tue, 11 May 1999, m. allan noah wrote:
>
> [...]
> > had to sync and the fs had to check. that took a while. the problem may
> > have been this is a dual proc (ppro 180) machine, and one of the cpu's
> > stopped working! mut the raid, and knfsd and ypserv running on this box
> > continued to work, it was so cool.
It was also a one in a fantazillion.
There is no way for Linux to magically transfer control from a CPU that no
longer works, to the healthy CPU. Which one is the healthy, if the two
disagree ? How do you get the most recently touched data from the halted
CPU, when the CPU is locked up and the data is in L1/L2 cache ?
It's a no-go. You want Tandem for that job, but I don't think they run
Linux (yet) :)
> What!? That's waaay cool. We have a couple of dual PPro 200
> machines that have literally toasted about a half dozen CPU fans, until I
> get some heavy duty 12v 6cm fans, a couple leds, a buzzer and a relay and
> cook up a home brew fail-safe (at least horrible-alarm-safe) system. They
> use to run NiceTry (now they're Linux-converted), and the system
> freezed...
My dual PPro-150 used to lock up every two months or so, because of cooler
failures. That stopped when I got two fans that are too large to fail. :)
(Yes, size _does_ matter)
> Maybe that's what have happened to you? One CPU fan went dead? I can't
> figure out how one CPU can freeze and the other keep on with the job
> without locking the entire machine... or maybe this is one more wonder of
> Linux on the PC architecture?
It's quite possible that the CPU locked up because of over-heating. CPUs does
that.
But I think I can safely say that the fact that the system appeared to be working
afterwards, is not a wonder of Linux. It is luck on a scale not often seen. If
that happened to me, I'd bet all my money on horse-races and hope I was riding a
wave...
> Please clear this out as it could be a marvellous point for Linux
> advocacy :)
Well, it definitely matches
`` NT is stable, eh, we wouldn't call it enterprise if it wasn't, right ?''
or
`` *BSD is more stable than Linux, because..., eh, someone told me once I think ''
Nah... We'd better not :)
Cheers,
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:.........................: putrid forms of man :
: Jakob Østergaard : See him rise and claim the earth, :
: OZ9ABN : his downfall is at hand. :
:.........................:............{Konkhra}...............:
