Setup Guide

• Jumbo frame size is set to the maximum for all interfaces 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.
Enter the iscsi profile-compellent command in INTERFACE Conguration mode.
Synchronizing iSCSI Sessions Learned on VLT-Lags with VLT-
Peer
The following behavior occurs during synchronization of iSCSI sessions.
• If the iSCSI login request packet is received on a port belonging to a VLT lag, the information is synced to the VLT peer and the
connection is associated with this interface.
• Additional updates to connections (including aging updates) that are learnt on VLT lag members are synced to the peer.
• When receiving an iSCSI login request on a non-VLT interface followed by a response from a VLT interface, the session is not synced
since it is initially learnt on a non-VLT interface through the request packet.
• The peer generates a new connection log that sees the login response packet. If the login response packet uses the ICL path, it is seen
by both the peers, which in turn generate logs for this connection.
Enable and Disable iSCSI Optimization
The following describes enabling and disabling iSCSI optimizaiton.
NOTE
: iSCSI monitoring is disabled by default. iSCSI auto-conguration and auto-detection is enabled by default.
If you enable iSCSI, ow control is automatically enabled on all interfaces. To disable ow control on all interfaces, use the no flow
control rx on tx off
command and save the conguration. To disable iSCSI optimization, which can turn on ow control again on
reboot, use the no iscsi enable command and save the conguration.
When you enable iSCSI on the switch, the following actions occur:
• Link-level ow control is globally enabled, if it is not already enabled, and PFC is disabled.
• iSCSI session snooping is enabled.
• iSCSI LLDP monitoring starts to automatically detect EqualLogic arrays.
The following message displays when you enable iSCSI on a switch and describes the conguration 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 interfaces. 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 recongure any of the auto-provisioned conguration 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, ow control, portfast, or storm control conguration applied as a result of enabling iSCSI.
NOTE
: By default, CAM allocation for iSCSI is set to 0. This disables session monitoring.
438 iSCSI Optimization