Re: help with ram question

On Thu, 2007-05-31 at 11:51 -0700, Paula J. Lindsay wrote:
Hi,
I've just installed a fc5 machine. He needs this rev because it is
compatible with his bruker software.
Anyway, he already had 1 gig of memory in the machine, but when we put
another bank of memory (1 gig)
we could not boot up. We did a switch and they (both 1 gig dimms) and
they both work apart, but not
together. Has anyone ran into this problem? I guess I could look on
fedoraproject.org to see if fc5
supports 2 gigs of ram. Anyway, any suggestions/advice/opinions are
appreciated. Thank you in advance.

Fedora supports up to 64GB of RAM. I have four machines running FC5
(yes, I know), each with 8GB. I even have (gasp!) RHEL 3.5 machines
(2.4 kernels) running 16GB (hugemem kernel).

You didn't say where the boot fails. Is it right after power up and/or
before the system tries to get to the hard drive? If so, then you
really have a hardware issue!

If it fails before the grub "Loading linux xxxxxxx..." screen, I'd
suspect you still have hardware issues (grub doesn't need much RAM and
it doesn't care how much there is above what it needs).

If it fails after the initial nash signon messages, you may still have
hardware issues as NOW the Linux kernel is involved and memory will be
flogged harder than Windows does. Remember, just because a system will
run Windows doesn't mean it'll run Linux. I've seen many systems that
run Windows OK but die quickly under Linux or memtest86. Boot off the
first CD and at the "boot:" prompt, enter "memtest86" and test the RAM.

As far as fault isolation is concerned, verify that the memory modules
are the same class. Check your hardware docs and see if they should be
in adjoining or separate sockets (some systems require that). Check to
make sure you're running the latest BIOS on your mobo. See if you can
"slow" the machine down so the memory timing isn't as critical.

----------------------------------------------------------------------
- Rick Stevens, Principal Engineer rstevens@xxxxxxxxxxxx -
- VitalStream, Inc. http://www.vitalstream.com -
- -
- Admitting you have a problem is the first step toward getting -
- medicated for it. -- Jim Evarts (http://www.TopFive.com) -
----------------------------------------------------------------------

--
fedora-list mailing list
fedora-list@xxxxxxxxxx
To unsubscribe: https://www.redhat.com/mailman/listinfo/fedora-list

Relevant Pages

  • Re: help with ram question
    ... I've just installed a fc5 machine. ... Anyway, he already had 1 gig of memory in the machine, but when we put ... You didn't say where the boot fails. ...
    (Fedora)
  • huge bss segment and sbrk failure with rhel 32bit hugemem
    ... I am trying to push 32 bit linux almost to the limit as ... far as the use of virtual memory within a single process. ... Sometimes it seems that sbrk is failing, ... I have a huge, (really huge, approx 3.8 gig) bss segment, using the ...
    (comp.os.linux.development.system)
  • How to minimize system memory for a computational grid of linux servers
    ... I have an application that is running on a total of 7 linux ... files with around 1 gig of data) and will then cache that in local data ... check the free memory it is down to about 20meg and I thought the ... cache which is using about 1 gig of memory. ...
    (comp.os.linux.misc)
  • Re: max # of threads
    ... what architecture and version of linux? ... Hmmm. ... I get 1232 with the 5.8.8 on a machine with 2 gig of memory before ...
    (comp.lang.perl.misc)
  • Slowly all my memory gets used up by fedora (2 GB)
    ... i`ve had this problem for a while (since FC5 if `im right) and slowly all my ... i did the top command but that doesn`t show anything unusual besides that ... all my memory is used. ... or is this the memory management of linux? ...
    (Fedora)