Owner's Manual

40 iSCSI Cluster Setup for EqualLogic Storage Systems
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 it is not turned
on, 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
Verify the Jumbo Frame setting using the ifconfig command:
$ ifconfig eth2
eth2 Link encap:Ethernet HWaddr
00:15:17:80:43:50
inet addr:10.16.7.125 Bcast:10.16.7.255
Mask:255.255.255.0
inet6 addr: fe80::215:17ff:fe80:4350/64
Scope:Link
Lnx_Stnwt.book Page 40 Jeudi, 16. juillet 2009 1:36 13