Information Monitored in iSCSI TrafficFlowsiSCSI optimization examines the following data in packets and uses the data to track the session and createthe 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• Connection ID• Aging• Up TimeIf 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 indicatingthe queue rate limit has been reached:%Z9500LC48:1 %ACL_AGENT-3-ISCSI_OPT_MAX_SESS_LIMIT_REACHED: Monitored iSCSIsessionsreached maximum limitNOTE: If you are using EqualLogic or Compellent storage arrays, more than 256 simultaneous iSCSIsessions are possible. However, iSCSI session monitoring is not capable of monitoring more than 256simultaneous iSCSI sessions. If this number is exceeded, sessions are not detected by the switch; but itdoes not affect forwarding. Dell Networking recommends that you disable iSCSI session monitoring forEqualLogic and Compellent storage arrays or for installations with more than 256 simultaneous iSCSIsessions.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 theentire topology.After a switch is reloaded, any information exchanged during the initial handshake is not available. If theswitch picks up the communication after reloading, it would detect a session was in progress but could notobtain complete information for it. Any incomplete information of this type would not be available in theshow commands.iSCSI Optimization 619
