Storage Foundation for Oracle® RAC 8.0.2 Configuration and Upgrade Guide - Linux

Preparing for configuration

1. Set the maximum transmission unit (MTU) of all the high-priority links to the highest value (9000) to ensure optimal performance. You may also choose to use the default MTU (1500).

   Ensure that the network path MTU is the same as the MTU of the NIC.

   To change the MTU size of a NIC permanently:

   a.	Edit the /etc/sysconfig/network-scripts/ifcfg-eth0 file # vi /etc/sysconfig/network-scripts/ifcfg-eth0
   b.	Add MTU settings at the end of the file: MTU=9000
   c.	Save and close the file and restart networking # service network restart

2. Enable the LLT ports in firewall.

Configuring LLT over UDP Multiport

1. Use the following shell script to increase the size of network buffers which consequently increases the send and receive TCP/IP buffers. This script also tunes the Rx /Tx queue size to max and enables the receive side scaling (RSS) functionality of the NIC.

   #---------------------------------------
   set -x
   
   for card in `cat /etc/llttab | grep -v "lowpri" | grep -w "link" | 
                    awk '{print $2}'`;
   do
       echo -e "Changeing buffers of $card"
       ethtool -G $card rx 4096
       ethtool -G $card rx-jumbo 4096
       ethtool -G $card tx 4096
       ethtool -N $card rx-flow-hash udp4 sdfn ethtool -N 
                          $card rx-flow-hash tcp4 sdfn
       sysctl -w net.ipv4.conf.${card}.arp_ignore=1
   done
   
   sysctl -w net.core.rmem_max=1600000000
   sysctl -w net.core.wmem_max=1600000000
   sysctl -w net.core.netdev_max_backlog=250000
   sysctl -w net.core.rmem_default=4194304
   sysctl -w net.core.wmem_default=4194304
   sysctl -w net.core.optmem_max=4194304
   sysctl -w net.ipv4.udp_rmem_min=819200
   sysctl -w net.ipv4.udp_wmem_min=819200
   sysctl -w net.core.netdev_budget=600
   set +x
   #---------------------------------------------
   

2. Install Veritas InfoScale using the installer and select UDP as LLT protocol

   # ./installer

   The installer automatically enables the UDP Multiport feature and creates four additional sockets for each LLT link.

3. Verify that UDP multiport links are enabled

   # lltstat -nvvr configured