[Beowulf] Re: PowerEdge SC 1435: Unexplained Crashes.

Skylar Thompson skylar at cs.earlham.edu
Fri Oct 17 09:36:24 PDT 2008

Rahul Nabar wrote:
> Maybe! But I wasn't sure "how close". During iffy debugs
> "misrepresenting" is always tricky since one never knows when it is
> some small detail that its choking on.
> Primarily I wanted to rule out that this is hardware and not OS or
> code (which is what the techs want to always deflect me to).
> Boils down to this: "if I let you run whatever crappy buggy code and
> OS that you wanted could you ever get good hardware to go into the
> "orange light" crashed mode?" I don't know. What do you guys say?

Yes. When Intel went from 36-bit to 38-bit physical memory addressing,
you had to be running a kernel capable of doing 38-bit addressing or
you'd get wacky errors in your system logs. We had a bunch of Poweredge
1950s reporting CPU errors and flashing their orange lights, but never
had any system crashes. On the SAGE or LOPSA list, somebody reported
similar errors with HP Proliants. Here's the RedHat knowledgebase
article on it:


-- Skylar Thompson (skylar at cs.earlham.edu)
-- http://www.cs.earlham.edu/~skylar/

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