I need a rather quick answer to this, so will ask the question while
continuing googling:

I've just upgraded the memory on an HP/Compaq DL380 G4 server running
RHEL5, from 4GB to 6GB. But Red Hat only sees 4GB.

A quick google tells me that I either need to install the kernel-PAE
package, or the hugemem kernel. Is that correct? Yum shows me that
kernel-PAE is available, but not kernel-hugemem.

This server runs Oracle and is quite important to the business, so I
can't just "have a go" and hope upgrading the kernel doesn't break
anything.

Any advice on this will be appreciated very much.

grub.conf:

title Red Hat Enterprise Linux Server (2.6.18-53.1.4.el5)
    root (hd0,0)
    kernel /vmlinuz-2.6.18-53.1.4.el5 ro root=/dev/VolGroup00/root
rhgb quiet crashkernel=128M@(protected)>
    initrd /initrd-2.6.18-53.1.4.el5.img
title Red Hat Enterprise Linux Server (2.6.18-8.el5)
    root (hd0,0)
    kernel /vmlinuz-2.6.18-8.el5 ro root=/dev/VolGroup00/root rhgb
quiet crashkernel=128M@(protected)>
    initrd /initrd-2.6.18-8.el5.img

Thanks.
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