Configuring iSCSI Optimization 465
"Configuring iSCSI Optimization Between Servers and a Disk Array" on
page473.
iSCSI CoS and Priority Flow Control/Enhanced Transmission Selection Interactions
When manually or automatically enabling the classification of iSCSI flows on
N4000 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 N4000 series switches to originate iSCSI
configuration information via DCBX. In this case, enabling iSCSI CoS
classification configures the N4000 switch to generate the iSCSI TLV via
DCBX in support of configuring directly connected storage and initiator
devices. N4000 series switches support b oth ETS and DCBx and support
DCB configuration in conjunction with EQL devices.
NOTE: The ETS feature is available on the N4000 switches only.