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Operating Systems Linux Red Hat red hat Linux 5.0 is detecting 3gb ram but physical ram is 16gb Post 302274829 by wazzu62 on Thursday 8th of January 2009 01:01:29 PM
Old 01-08-2009
try using the hugemem kernel

I believe starting the RHEL3 RedHat offers a hugemem kernel supports a 4GB per process user space and a 4GB direct kernel space. The hugemem kernel allows systems with up to 64GB of main memory and is required in order to use all the memory in system configured with more than 16GB of memory.
 

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NEW-KERNEL-PKG(8)					      System Manager's Manual						 NEW-KERNEL-PKG(8)

NAME
new-kernel-pkg - tool to script kernel installation SYNOPSIS
new-kernel-pkg [-v] [--mkinitrd] [--rminitrd] [--dracut] [--initrdfile=initrd-image [--depmod] [--rmmoddep] [--kernel-args=args] [--remove-args=args] [--banner=banner] [--multiboot=multiboot] [--mbargs=mbargs] [--make-default] [--add-dracut-args] [--add-plymouth-initrd] [--host-only] <--install | --remove | --update | --rpmposttrans> <kernel-version> DESCRIPTION
new-kernel-pkg is a tool used in packaging to automate the installation of a new kernel, including the creation of an initial ram filesys- tem image, updating of bootloader configuration, and other associated tasks. OPTIONS
-v Be verbose. --mkinitrd Create a new initial ram filesystem image. --rminitrd Remove an initial ram filesystem image. --dracut When creating a new initial ram filesystem image, use dracut(8) rather than mkinitrd(8). Used in conjunction with --mkinitrd . --initrdfile=initrd-image Use the specified file as the initial ram filesystem image. --depmod Create modules.dep and related files. --rmmoddep Remove modules.dep and related files. --kernel-args=args Use args as the boot command line for this kernel. --remove-args=args Remove specified kernel arguments for this kernel. --banner=banner Display banner as the banner text in the bootloader. --multiboot=multiboot-image Use multiboot-image as a multiboot image. --mbargs=mbargs Use mbargs as arguments to the multiboot image. --make-default Make this kernel the default boot option. --add-dracut-args Automatically generate dracut options and add them to the kernel command line. --add-plymouth-initrd Automatically add plymouth to the initial ram filesystem image. --host-only Make an initial ram filesystem image that is specific to the running system. --install kernel-version Install a new kernel. --remove kernel-version Remove an installed kernel. --update kernel-version Update the specified kernel. --rpmposttrans kernel-version Run the rpmposttrans for the specified kernel. SEE ALSO
grubby(8) installkernel(8) AUTHORS
Erik Troan Jeremy Katz Peter Jones Wed Apr 14 2010 NEW-KERNEL-PKG(8)
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