When installing Oracle RAC or database software, you need to make some changes to the Linux kernel parameters.
# For Oracle 10g RAC
kernel.sem=250 32000 100 128
kernel.shmmax=1048576000
kernel.shmmni=4096
kernel.shmall=2097152
fs.file-max=65536
net.core.rmem_default=262144
net.core.rmem_max=262144
net.core.wmem_default=262144
net.core.wmem_max=262144
net.ipv4.ip_local_port_range=1024 65000
Just append the above lines to the end of file "/etc/sysctl.conf", and then run the following command to take them affect.
sysctl -p
I also like to chang the following parameters, not sure whether it's good or not.
vm.overcommit_ratio = 10
vm.swappiness = 30
vm.dirty_ratio = 20
Installing Oracle RAC on RedHat Linux Advanced Server is very easy.