Information Monitored In Iscsi Traffic Flows - Dell C9000 Series Networking Configuration Manual

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
• Connection ID
• Aging
• 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.
iSCSI Optimization 619