[CentOS] CentOS 5.4 x86_64 only detects 32GB RAM while Fedora x86_64 correctly lists 128GB

Jake jakepaulus at gmail.com
Mon Dec 7 21:49:38 UTC 2009


On Mon, Dec 7, 2009 at 4:35 PM, Lucian @ lastdot.org <lucian at lastdot.org>wrote:

> On Mon, Dec 7, 2009 at 12:24 PM, Diederick Stoffers
> <d.stoffers at gmail.com> wrote:
> > [root at localhost ~]# uname -a
> > Linux localhost.localdomain 2.6.18-164.6.1.el5xen #1 SMP Tue Nov 3
> 16:48:13
> > EST 2009 x86_64 x86_64 x86_64 GNU/Linux
> >
> > On 7 dec 2009, at 13:12, Rudi Ahlers wrote:
> >
> > what kernel are you running?
> >
> > On Mon, Dec 7, 2009 at 2:05 PM, Diederick Stoffers <d.stoffers at gmail.com
> >
> > wrote:
> >
> > Hi,
> >
> > We have a new 24-core Dell PowerEdge R905 server with 128GB's RAM. The 64
> >
> > bits version of Fedora 12 lists the correct amount of 128GB, CentOS only
> >
> > finds 32GB (and so does Scientific Linux). I would much prefer to use
> CentOS
> >
> > (most of the software we use is specifically designed for CentOS). Does
> >
> > anyone know what is causing this/how to fix it?
> >
> > Many Thanks,
> >
> > Diederick
>

From:
http://www.redhat.com/docs/manuals/enterprise/RHEL-5-manual/Virtualization-en-US/ch-virt-hw-support.html


"The Red Hat Enterprise Linux Virtualization kernel does not support more
than 32GB of memory for x86_64 systems. If you need to boot the
virtualization kernel on systems with more than 32GB of physical memory
installed, you must append the kernel command line with mem=32G. This
example shows how to enable the proper parameters in the grub.conf file:

title Red Hat Enterprise Linux Server  (2.6.18-4.elxen)
root  (hd0, 0)
kernel   /xen.gz-2.6.18-4-el5 mem=32G
module   /vmlinuz -2.6.18-4.el5xen ro root=LABEL=/
module   /initrd-2.6.18-4.el5xen.img"


-- 
Jake Paulus
JakePaulus at gmail.com
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