Server memory problems

[Peter Jeremy]

On 2012-Jul-16 19:45:18 -0400, Andy Young <ayoung at mosaicarchive.com> wrote:
>I am having trouble with one of our servers and I'm not sure what to try
>next. It has a Supermicro H8DGi-F motherboard with two 16-core AMD
>processors and two memory banks, one for each processor. When I originally
>built it, I only had one processor and 40 GB of ram. Everything worked
>awesome. I recently upgraded it, adding another processor and another 40 GB
>of ram. It was incredibly unstable and constantly rebooted within minute or
>two of uptime, sometimes it wouldn't even boot all the way before crashing
>and rebooting again.
...
>other ideas? Again, its perfectly stable with two processors and 64 GB of
>memory but goes nuts when I more.

Have you checked the motherboard notes to ensure that your configuration
is supported?  Is the BIOS up to date?

What version of FreeBSD is this?  And I presume it's amd64 rather than
i386+PAE.

Have you tried running memtest86 or memtest86+?  (You might like to
run both because ISTR only the former handles SMP).

Can you capture the output from a verbose boot with all the memory
installed?  The SMAP and/or physical memory layout might offer a
clue as to what is going wrong.

-- 
Peter Jeremy
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