Dell PowerConnect 8024 User Configuration Manual page 400

The following commands show how to configure the iSCSI example depicted
in Figure 17-6.
1 Enable iSCSI optimization on the switch if it has been previously disabled
(iSCSI optimization is enabled by default).
console#config
console(config)#iscsi enable
2 Configure the switch to associate the DSCP priority 45 (and the queue
that is mapped to it) with detected iSCSI session traffic. The remark
keyword indicates that the switch should add this priority marking on
packets as it forwards them.
console(config)#iscsi cos dscp 45 remark
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
400
Configuring iSCSI Optimization