Owner's Manual

50 Setting Up an iSCSI Cluster
Configuring the iSCSI Networks
It is recommended to configure the host network interfaces for iSCSI traffic
to use Flow Control and Jumbo Frame for optimal performance.
Use the ethtool utility to configure Flow Control.
Use the following command to check for Flow Control (RX/TX Pause)
on the interfaces: # ethtool -a <interface>
For example:
# ethtool -a eth2
Pause parameters for eth2:
Autonegotiate: on
RX: on
TX: on
This example shows that Flow Control is already turned on. If not, use the
following command to turn on Flow Control:
# ethtool -A <interface> rx on tx on
Jumbo Frame is configured in the /etc/sysconfig/network-scripts/ifcfg-
<interface> scripts, by adding the MTU="<mtu-value>" parameter.
The example below shows the MTU set to 9000.
# cat /etc/sysconfig/network-scripts/ifcfg-eth2
DEVICE=eth2
HWADDR=00:15:17:80:43:50
ONBOOT=yes
TYPE=Ethernet
BOOTPROTO=none
IPADDR=10.16.7.125
NETMASK=255.255.255.0
USERCTL=no
MTU=9000