[NTLUG:Discuss] SunFire X2200 M2 memory strangeness

[Ralph Green]

Howdy Eric,

On 8/28/13, Eric Schnoebelen <eric at cirr.com> wrote:
>
> I have an X2200M2 in service here, so maybe I can provide some
> assistance.
>
> -  1. Why would the bigger sticks only work in memory bank 1?
>
> Are you sure the spec's of the 2Gb devices are supported by the
> X2200M2? All the documentation I've found
  I don't know.  That is why I am asking.  I did see that at least one
lower speed of memory is supported, and that was why I even tried it.

>
> I suspect they only worked in bank 1 because they weren't being
> as heavily probed as bank 0, or they had long enough to respond
> to the probes.
  That seems like a reasonable theory.  It was the fact that the
memory seems to work in one bank and not the other that I thought was
particularly strange and made me ask the questions.

>
> -  2. Is there any problem running 3 times as much memory in one bank?
>
> I wouldn't think there'd be any problems, assuming the memory
> all worked..
>
> But, I really expect some serious problems once you get the
> system under memory load.
  Maybe I should start off by running memtest86 for a few days.  Do
you know a better memory test?
>
> -  I am planning on using this as a database server and I am looking
> - forward to being able to have 16 GB of RAM and 4 pretty good CPUs to
> - test with.  The server will go back to the charity, but I get to play
> - with it a while.
>
> If the charity would rather have money for the unit, I would be
> interested in aquiring it as a spare..
  I can ask.  They have a half dozen of the servers, I think.  It is
managed differently from most donations, and there is one guy
controlling them.  It is not anything funny, but it is probably too
off topic for me to go into details on the list.  What do you think
they are worth?  Tell me off list, if that is better.  They were
willing to let me risk ruining one with an experiment I am trying to
make it quieter.  I am looking for a replacement connector for the
power cable to the fans.  It does not have to be pretty, so I'll check
at Tanners on my next visit.  I have pictures and measurements if
someone wants them.
>
> I hope the above helps,	
> 	Eric
  Yes, thank you Eric.
Good day,
Ralph