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Increase RAM on RedHat 9 server

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by tmelo

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I have recently increased the amount of RAM on my sevrer from 386MB to 640MB. However, when I TOP still shows that I still only have 386MB Total. I'm using GRUB as my boot loader, is there something I have to do to GRUB to get the OS to see the additional RAM? Thanks in advance.

2 replies

by bhughes1

tmelo@docent.com:

When the system boots up (BIOS POST), does the system recognize the added RAM? If so, i think you might want to check kernel settings.

by lordinfidel

Typically the default kernel config will address up to 960 megs. After that you have to enable High Memory Support.

But since you did not pass the 960 meg mark. We can force the kernel to identify your 640.

vi /etc/grub.conf

add (all on one line)

kernel /boot/vmlinuz-AddYourKernelVersion mem=640

Assuming that you have not updated your kernel, 2.4.20-6 ships with RH9. Look in /boot to see what your version is or just uname -a

So your line should read
kernel /boot/vmlinuz-2.4.20-6 mem=640
:wq
shutdown -r now
and see what happens.

BTW- this was borrowed from pg 42 of Linux Server Hacks Tip#21. Buy it from O'reilly.

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