Owner`s manual

iSCSI Optimization | 161
Information Monitored in iSCSI Traffic Flows
iSCSI optimization examines the following data in packets and uses the data to track the session and create
the classifier entries that enable QoS treatment:
• Initiator’s IP Address
• Target’s IP Address
• ISID (Initiator defined session identifier)
• Initiator’s IQN (iSCSI qualified name)
• Target’s IQN
• Initiator’s TCP Port
• Target’s TCP Port
If no iSCSI traffic is detected for a session during a user-configurable aging period, the session data clears.
Detection and Auto configuration for Dell EqualLogic Arrays
The iSCSI optimization feature includes auto-provisioning support with the ability to detect directly
connected Dell EqualLogic storage arrays and automatically reconfigure the switch to enhance storage
traffic flows.
The Aggregator uses the link layer discovery protocol (LLDP) to discover Dell EqualLogic devices on the
network. LLDP is enabled by default. For more information about LLDP, refer to Link Layer Discovery
Protocol (LLDP).
The following message displays the first time a Dell EqualLogic array is detected and describes the
configuration changes that are automatically performed:
%STKUNIT0-M:CP %IFMGR-5-IFM_ISCSI_AUTO_CONFIG: This switch is being configured
for optimal conditions to support iSCSI traffic which will cause some automatic
configuration to occur including jumbo frames and flow-control on all ports; no
storm control to be enabled on the port of detection.
The following syslog message is generated the first time an EqualLogic array is detected:
%STKUNIT0-M:CP %LLDP-5-LLDP_EQL_DETECTED: EqualLogic Storage Array detected on
interface Te 1/43
• At the first detection of an EqualLogic array, a maximum transmission unit (MTU) of 12000 is enabled
on all ports and port-channels (if it is has not already been enabled).
• Spanning-tree portfast is enabled on the interface identified by LLDP if the port is in L2 mode.
• Unicast storm control is disabled on the interface identified by LLDP.
iSCSI Optimization: Operation
When the Aggregator auto-configures with iSCSI enabled, the following occurs: