[CentOS] how to debug hardware lockups?

[Les Mikesell]

Rudi Ahlers wrote:
>> 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

Yes, apparently RAM errors can be subtle and only appear when certain 
adjacent bit patterns are stored - or when the moon is in a certain 
phase or something.

-- 
   Les Mikesell
    lesmikesell at gmail.com