How to permanently set shmmax

tikit · 06-10-2010, 03:47 PM

Hi,

for Oracle installation, I need to set kernel.shmmax parameter to 8416559104

According to the manual I did the following:

Code:

vi /etc/sysctl.conf
shmmax = 8416559104
/sbin/chkconfig boot.sysctl on
/sbin/sysctl -p

when I check the value

Code:

cat /proc/sys/kernel/shmmax 
8416559104

it looks OK, but after reboot there is the default value 3294967296 again.

What am I doing wrong?

The system is 64-bit SLES11.

Thanks for helping

harry edwards · 06-10-2010, 04:31 PM

Can you post the content of /etc/sysctl.conf

Also,does thishelp.

tikit · 06-11-2010, 01:24 AM

Hi,

here is my /etc/sysctl.conf

Code:

# Disable response to broadcasts.
# You don't want yourself becoming a Smurf amplifier.
net.ipv4.icmp_echo_ignore_broadcasts = 1
# enable route verification on all interfaces
net.ipv4.conf.all.rp_filter = 1
# enable ipV6 forwarding
#net.ipv6.conf.all.forwarding = 1
# increase the number of possible inotify(7) watches
fs.inotify.max_user_watches = 65536
# avoid deleting secondary IPs on deleting the primary IP
net.ipv4.conf.default.promote_secondaries = 1
net.ipv4.conf.all.promote_secondaries = 1
# Oracle Database Kernel Parameters
kernel.shmmax = 8416559104
kernel.sem = 250  256000  128 1024
net.ipv4.ip_local_port_range = 1024 65000
net.core.rmem_default = 262144
net.core.rmem_max = 262144
net.core.wmem_default = 262144
net.core.wmem_max = 262144

The link did not work for me.

Thanks

tikit · 06-11-2010, 01:39 AM

Hi,

I solved it. The default value of 3294967296 was set in /etc/sysconfig/oracle, that is why it was being rewritten after reboot.