LinuxHostingSupport

Why do server not showing up 4GB of RAM? By default a server supports up to a 4GB of RAM i.e. on a non-PAE kernel. If you wish to add 4GB RAM or more, you will have to install kernel-PAE package which addresses upto 64GB of RAM. Once you install the kernel with the PAE module, the server will show you the correct amount of installed RAM.

Use yum to install the module:

yum install kernel-PAE

Once the module is installed, you will have to edit the grub configuration file to make sure the new kernel is picked up on reboot. Edit the file using your favrioute editor:

pico /etc/grub/grub.conf

and change the line

default = 1

to

default = 0

Save and Exit the file. Once done, reboot the server for the changes to take effect.