Reference Guide

You can configure whether iSCSI frames are re-marked to contain the configured VLAN priority tag or IP DSCP when forwarded
through the switch.
NOTE: On a switch in which a large proportion of traffic is iSCSI, CoS queue assignments may interfere with other network
control-plane traffic, such as ARP or LACP. Balance preferential treatment of iSCSI traffic against the needs of other
critical data in the network.
406 iSCSI Optimization