Iscsi Cos And Priority Flow Control/Enhanced Transmission Selection Interactions - Dell PowerConnect 8024 User Configuration Manual

iSCSI CoS and Priority Flow Control/Enhanced Transmission Selection
Interactions
When manually or automatically enabling the classification of iSCSI flows on
PC80xx/PCM8024-k/PC81xx series switches, enabling iSCSI CoS is not
recommended unless required as follows.
When using manual configuration of the switch or auto-configuration via
DCBX, the iSCSI packets are classified based on the user priority present in
the VLAN tag and, in this case, enabling iSCSI CoS classification via the
iSCSI command set provides no benefit. The only case for enabling iSCSI
CoS prioritization is when using PC81xx-series switches to originate iSCSI
configuration information via DCBX. In this case, enabling iSCSI CoS
classification configures the PC81xx switch to generate the iSCSI TLV via
DCBX in support of configuring directly connected storage and initiator
devices. Since EQL iSCSI devices require ETS settings to function correctly
with DCBx, the PC80xx and M8024-k series PowerConnect switches (which
do not support ETS) should disable DCB when EQL devices are connected.
PC8100 series switches support both ETS and DCBx and support DCB
configuration in conjunction with EQL devices.
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Configuring iSCSI Optimization