Server memory problems

[Lanny Baron]

Hi Andy,
Sounds to me like you have 1) a flakey board, 2) the memory is not 
identical. We never use kingston for a variety of reasons, but you 
really should see if the part numbers are identical. The timings on the 
drams is critical. I would never mix capacities. 3) Make sure the memory 
is all the same i.e. registered e.c.c. or non registered e.c.c.

I don't think its the power supply, but it can be.
Regards,
Lanny
http://www.servaris.com or http://www.freebsdsystems.com


On 7/17/2012 1:16 PM, Andy Young wrote:
> Hi Erich,
>
> Why would the power supply be suspect since the machine is perfectly stable
> with 64 GB of memory in it?
>
> The server won't stay up long enough to run memtest.
>
> Andy
>
> On Mon, Jul 16, 2012 at 8:59 PM, Erich Dollansky <
> erichfreebsdlist at ovitrap.com> wrote:
>
>> Hi,
>>
>> On Tuesday 17 July 2012 06:45:18 Andy Young 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. Seemed like a memory issue so I scaled it back to
>> two
>>> processors and 32 GB (4x8GB) of ram. Worked well so I added the
>> remaining 8
>>> GB sticks I had, bringing it up to 64 GB. Still worked great. The sticks
>> I
>>> had left were a mix and match variety of 8GB and 4GB sticks. Thinking
>> maybe
>>> there was some problem with mixing them, I ordered more 8GB memory just
>>> like the ones in the box. While waiting for the new memory, the machine
>>> performed great with no issues. New memory arrived and I added two more
>> 8GB
>>> sticks. Immediately the constant crashing returned. It seems really
>>> unlikely that I got bad memory in two separate orders. Does anyone have
>> any
>>> other ideas? Again, its perfectly stable with two processors and 64 GB of
>>> memory but goes nuts when I more.
>>>
>> could it be caused by the power supply?
>>
>> Did you run a memory test?
>>
>> If possible, try different power supplies.
>>
>>> I really appreciate the help!!
>>>
>>> Motherboard: Supermicro H8DGi-F
>>> CPU: 2 x AMD 6274 (2.2 Ghz 16-core)
>>> Memory: Kingston 8GB DDR3 1333
>>
>> No ECC?
>>
>> Erich
>>
>
>
>