Reference Guide

iSCSI Optimization | 483
The following message is displayed the first time you use the iscsi profile-compellent command to
configure a port connected to a Dell Compellent storage array and describes the configuration changes that
are automatically performed:
%STKUNIT0-M: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.
After you execute the iscsi profile-compellent command, the following actions occur:
• Jumbo frame size is set to 12000 for all on all ports and port-channels, if it is not already enabled.
• Spanning-tree portfast is enabled on the interface.
• Unicast storm control is disabled on the interface.
You must enter the
iscsi profile-compellent command in INTERFACE configuration mode; for example:
Dell(conf-if-te-o/50# iscsi profile-compellent
Enabling and Disabling iSCSI Optimization
On an S5000 switch, iSCSI optimization is disabled by default and configured as follows:
• iSCSI session snooping is disabled and CAM allocation for iSCSI is set to 0.
• iSCSI auto-configuration and auto-detection are disabled.
When you enable iSCSI on the switch:
• If PFC is disabled on an interface, link-level flow control is enabled and flow control settings are set to
rx on tx off on the interface. (If PFC is enabled on an interface, link-level flow control cannot be
enabled.)
• iSCSI session snooping is enabled.
• iSCSI LLDP monitoring starts to automatically detect EqualLogic arrays.
The following message is displayed when you enable iSCSI on a switch and describes the configuration
changes that are automatically performed:
%STKUNIT0-M:CP %IFMGR-5-IFM_ISCSI_ENABLE: iSCSI has been enabled causing flow control to be
enabled on all . EQL detection and enabling iscsi profile-compellent on an interface may cause
some automatic configurations to occur like jumbo frames on all ports and no storm control and
spanning tree port-fast on the port of detection.
You can reconfigure any of the auto-provisioned configuration settings that result when you enable iSCSI
on a switch.
When you disable the iSCSI feature, iSCSI resources are released and the detection of EqualLogic arrays
using LLDP is disabled. Disabling iSCSI does not remove the MTU, flow control, portfast, or storm
control configuration applied as a result of enabling iSCSI.