Filter
Top Products
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, an MTU of 12000 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.
486
iSCSI Optimization