CentOS - Aug 2011 - new memory not getting regonized

dear All,

I had a Centos 5.5 OS running for about 6 months used as a Xen VM server  
prfectly running 3 Virtual machines

Its a Sun Blade server with 8 core Xeon Proceesor with 32 GB Ram

couple of days back I added another 32 gb ram .

The bios shows the added ram that is now it shows me 64 GB but the Centos  
OS just recognizes 32gb only

the OS details are:

Centos release 5.5 final
Kernel 2.6.18-194.32.1.el5xen on an x86_64

now also running uname -a shows me

Linux hypervisor2 2.6.18-194.32.1.el5xen #1 SMP Wed Jan 5 18:44:24 EST 2011  
x86_64 x86_64 x86_64 GNU/Linux

shows that PAE support is not there

I do believe that installing kernel PAE with yum should solve the problem  
but since the server is a online production server just wanted to verify if  
I would run into some problems

apprecite your kinf help and suggestions

regards


sylvan
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Hello Sylvan,

On Fri, 2011-08-26 at 10:10 +0000, sylvan.dcunha at gmail.com
wrote:
> Kernel 2.6.18-194.32.1.el5xen on an x86_64 
> I do believe that installing kernel PAE with yum should solve the
> problem but since the server is a online production server just wanted
> to verify if I would run into some problems 
I have no idea why your server doesn't see the extra 32GB, but you do
*not* need a PAE kernel. PAE is a hack for 32bit system to use more than
4GB of memory. Your machine is a 64bit system, so you don't need a PAE
kernel on it.

Regards,
Leonard.

-- 
mount -t life -o ro /dev/dna /genetic/research

From: "sylvan.dcunha at gmail.com" <sylvan.dcunha at
gmail.com>
>I had a Centos 5.5 OS??running for about 6 months used as a Xen VM server
prfectly running 3 Virtual machines
>Its a Sun Blade server with 8 core Xeon Proceesor with 32 GB Ram 
>couple of days back I added another 32 gb ram . 
>The bios shows the added ram that is now it shows me 64 GB but the Centos OS
just recognizes 32gb only

No Xen experience but did you do this?

http://wiki.xensource.com/xenwiki/XenFaq#head-f13e54576168210e3e59c16a1f2096e93ee4ed6d

JD