Dell C1048P Port Extender Networking Configuration Guide for the C9000 Series - Page 516

• Up Time If no iSCSI traffic is detected for a session during a user-configurable aging period, the session data is cleared. If more than 256 simultaneous sessions are logged continuously, the following message displays indicating the queue rate limit has been reached: %Z9500LC48:1 %ACL_AGENT-3-ISCSI_OPT_MAX_SESS_LIMIT_REACHED: Monitored iSCSI sessionsreached maximum limit NOTE: If you are using EqualLogic or Compellent storage arrays, more than 256 simultaneous iSCSI sessions are possible. However, iSCSI session monitoring is not capable of monitoring more than 256 simultaneous iSCSI sessions. If this number is exceeded, sessions are not detected by the switch; but it does not affect forwarding. Dell Networking recommends that you disable iSCSI session monitoring for EqualLogic and Compellent storage arrays or for installations with more than 256 simultaneous iSCSI sessions. Only sessions the switch observes are learned; sessions flowing through an adjacent switch are not learned. Session monitoring learns sessions that actually flow through the switch, it does not learn all sessions in the entire topology. After a switch is reloaded, any information exchanged during the initial handshake is not available. If the switch picks up the communication after reloading, it would detect a session was in progress but could not obtain complete information for it. Any incomplete information of this type would not be available in the show commands. 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 switch 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: %SYSTEM: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 and spanning-tree port fast to be enabled on the port of detection. The following syslog message is generated the first time an EqualLogic array is detected: %SYSTEM:CP %LLDP-5-LLDP_EQL_DETECTED: EqualLogic Storage Array detected on interface Te 1/ 43 • At the first detection of an EqualLogic array, the maximum supported MTU is enabled on all ports and port-channels (if it has not already been enabled). • Spanning-tree portfast is enabled on the interface LLDP identifies. • Unicast storm control is disabled on the interface LLDP identifies. Configuring Detection and Ports for Dell Compellent Arrays To configure a port connected to a Dell Compellent storage array, use the following command. • Configure a port connected to a Dell Compellent storage array. INTERFACE Configuration mode iscsi profile-compellent The command configures a port for the best iSCSI traffic conditions. iSCSI Optimization 516