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Installed Fedora (FC8) and puzzled to how to get it to see more than 3GB Ram? I was! March 26th, 2008
Well, just finished building a MySQL server for one of my customers, reasonable spec, Dell PowerEdge Server, 6GB Ram, 2 Intel Xeons, Fast Disks, should do the job great! Well, it would if it could see more than 3GB Ram!
After much googleing… and getting nowhere - here’s what i found:
 Install the PAE version of the Kernel:
“yum install kernel-PAE”
Cool. Now get Fedora to actually use that kernel on the next rebbot:
“vi /etc/grub.conf”
Look for the line “default=1″ Then change that to the corresponding kernel image you wanna load. Im my case it was title Fedora (2.6.24.3-34.fc8PAE), it was the first in the list, so I changed the default to:
“default=0″
:wq!
Then a quick “shutdown -r now”
when its back up you can do a quick “cat /etc/meminfo” to see how much ram the os can now see and use.Â
 On this server i was using Fedora Core 8 (FC8) and think this aplies to most newer linux distro’s. If you find that there isn’t a “kernel-pae” package to install try “kernel-smp”, woked on one of my older Fedora Core 4 servers i just chucked some more ram into. Good luck!
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The semi-coherent ramblings of a computer geek from Chorley. Here you will find many interesting discoveries I've found in my quest to make my job easier. It may well save you thousands of hours of random googleing in your quest to fix that awkward niggling should be easy and take less than a minute fault that’s still nagging at your stress level even after hours of googling. Well it might - only if you're a computer geek!