LinuxQuestions.org

LinuxQuestions.org (/questions/)
-   Linux - Enterprise (http://www.linuxquestions.org/questions/linux-enterprise-47/)
-   -   Red Hat EL5.0 is detecting only 3GB though physical is 16gb (http://www.linuxquestions.org/questions/linux-enterprise-47/red-hat-el5-0-is-detecting-only-3gb-though-physical-is-16gb-694196/)

manoj.linux 01-01-2009 01:22 AM

Red Hat EL5.0 is detecting only 3GB though physical is 16gb
 
Red Hat 5.0(32bit) is detecting only 3GB RAM

On server 16GB Ram is there and 64bit HW architecutre is there but Red Hat 5.0 [32 bit] is able to detect 3gb,

Can u give me some idea why?

pixellany 01-01-2009 05:52 AM

To directly address more than 4GB of RAM, you need 64-bit hardware AND software. There is a mechanism to get around this---PAE---but I don't know much about it.
....but Google does:
http://www.google.com/search?q=pae+l...S177US235&aq=t

The more direct approach is to install the 64-bit version of your favorite OS.

rweaver 01-05-2009 08:36 AM

Quote:

Originally Posted by manoj.linux (Post 3393228)
Red Hat 5.0(32bit) is detecting only 3GB RAM

On server 16GB Ram is there and 64bit HW architecutre is there but Red Hat 5.0 [32 bit] is able to detect 3gb,

Can u give me some idea why?

What Pix referenced above is correct, I think the kernel option is something like "big memory support" or "big ram support" in the kernel config. It's not part of the default config on most distributions however so likely you'll need to compile it in (if you want 32b linux). Better method as stated by others is to use 64b linux.

anomie 01-05-2009 11:42 AM

Right, you likely want RHEL 5 x86_64. See this related thread.

mcalizo 01-13-2009 06:33 AM

Hi,

All above suggestions are correct. But for quick fix you can just enable SMP support. That means that you need to make sure that during boot-up the SMP kernel is loaded.Sample output below shows that SMP kernel is loaded on a 32bit OS.

Linux hostname 2.6.9-67.0.4.ELsmp #1 SMP Fri Jan 18 05:00:58 EST 2008 i686 i686 i386 GNU/Linux.

Mike --
Registered Linux User # 365113


All times are GMT -5. The time now is 04:15 PM.