Installation guide

/sbin/ethtool -K eth2 tso off; \

/sbin/modprobe -i bonding -o bond0 \

mode=active-backup miimon=100 downdelay=300 updelay=300 primary=eth0

install bond1 /sbin/modprobe bnx2; /sbin/modprobe e1000; \

/sbin/ethtool -K eth3 tso off; \

/sbin/modprobe -i bonding -o bond1 \

mode=balance-alb miimon=100 downdelay=300 updelay=300

This example also shows the bond1 interface configured for load balancing. It may improve network throughput

for Oracle 10g RAC installations with dedicated switches for cluster interconnect.

Configure the PortFast feature on Cisco Ethernet switches for ports connected to the host. This should decrease

time required for link negotiation, especially for Gigabit links.

If all hosts on your LAN and network switches support jumbo frames ,you can enable this feature on network

interfaces to improve average network throughput and decrease CPU utilization. The real advantage can be

achieved only if your application is sending large amount of data through TCP or big UDP messages.

To configure jumbo frames, put the parameter MTU=9000 into the /etc/sysconfig/network-

scripts/ifcfg-ethX file.

Setting Shell Limits for the Oracle User

Most shells like bash provide control over various resources like the maximum allowable number of open file

descriptors or the maximum number of processes available to a user.

To see all shell limits, run:

# ulimit -a

For more information on ulimit for the bash shell, see man bash and search for 'ulimit'.

Limiting Maximum Number of Open File Descriptors for the Oracle User

After /proc/sys/fs/file-max has been changed (see the Setting File Handles section of this document)

there is still a per user limit of maximum open file descriptors:

$ su - oracle

$ ulimit -n

1024

To change this limit, edit the /etc/security/limits.conf file as root and make the following changes

or add the following lines, respectively:

oracle soft nofile 131072