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286 Configuring System Information
iSCSI Optimization
The Internet Small Computer System Interface (iSCSI) Optimization feature enables the switch to
detect the presence of EqualLogic (EQL) storage arrays on the network and automatically configure the
software to enhance the flow of storage traffic to the iSCSI device.
iSCSI optimization uses LLDP snooping to detect the presence and the removal of EQL arrays on the
network. In LLDP advertisements, these devices are distinguished by a 29-byte System Description TLV
that contains the value "Dell Equalogic Storage Array".
When the iSCSI optimization feature is enabled, the switch takes the following actions:
• Flow control is globally enabled (if it is not already enabled).
• Jumbo frames are globally enabled on all ports and port-channels (the MTU is globally set to 9216).
When an EQL device is identified, the software performs the following EQL-specific logic:
• Spanning Tree Port Fast mode is enabled on the interface identified by LLDP. In Port Fast mode, the
port is automatically placed in the "Forwarding" state when the port link is up, without waiting for
Spanning Tree convergence to complete.
• Unicast storm control is disabled on the interface identified by LLDP.
• RSTP is globally enabled.
By default, iSCSI Optimization is globally disabled and Flow Control is globally enabled.
iSCSI Optimization Global Configuration
Use the iSCSI Optimizations-Global Parameters page to enable and disable the feature.
To access the iSCSI Optimization Global Configuration page, click System → iSCSI → Global
Configuration in the navigation tree.