Dell PowerConnect 8024 User Configuration Manual page 410

The following commands show how to configure the iSCSI example depicted
in Figure 17-6. Remember that iSCSI optimization is enabled by default.
1 Set the MTU to 9216 to enable the use of jumbo frames.
console#config
console(config)#ip mtu 9216
2 Optionally configure the switch to associate CoS queue 5 with detected
iSCSI session traffic.
console(config)#iscsi cos enable
console(config)#exit
The default target port and IP address criteria is used to determine which
packets are snooped for iSCSI session data (ports 860 and 3260; any IP
address).
3 If the array is a Compellent storage array, execute the Compellent macro
on the ports attached to the array:
console#config
console(config)#macro global apply profile-compellent-nas
$interface_name te1/0/21
console(config)#macro global apply profile-compellent-nas
$interface_name te1/0/22
console(config)#macro global apply profile-compellent-nas
$interface_name te1/0/23
To configure a PC81xx switch in a lossless DCBX environment where another
switch connected to storage arrays supplies the DCBX configuration, perform
the following steps starting with a default configuration:
1 Enter global configuration mode and configure the MTU on the switch.
console#configure
console(config)#ip mtu 9216
2 Create VLAN 100. This command also enters the VLAN configuration
mode for VLAN 100.
console(config)#vlan 100
console(config-vlan100)#exit
3 Enable VLAN tagging to allow the CNA ports 1-4 to carry 802.1p priority
values through the network.
console(config)#interface range te1/0/1-4
console(config-if)#switchport mode trunk
410
Configuring iSCSI Optimization