[CentOS] how to debug hardware lockups?

> I had machine that would crash about once every week or two in normal
> operation. Memtest86+ found an error in the 2nd day of running.  The worst
> part was that it left the raid mirrors in a strange state that caused
> occasional problems for months even after replacing the RAM.
>
> --

Did you leave memtest86+ running for 2 days? I thought 1 or 2 cycles
would be good enough?

I'm hoping to pick-up the server in the next 2 hours then I can see
what happens when I run memtest86+ or other tests

-- 

Kind Regards
Rudi Ahlers