Users Guide

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.
Default iSCSI Optimization Values
The following table lists the default values for the iSCSI optimization feature.
Table 35. iSCSI Optimization Defaults
Parameter Default Value
iSCSI Optimization global setting Disabled on the S4810 and S4820T.
iSCSI CoS mode (802.1p priority queue mapping) dot1p priority 4 without the remark setting when you enable
iSCSI. If you do not enable iSCSI, this feature is disabled.
iSCSI CoS Packet classication When you enable iSCSI, iSCSI packets are queued based on
dot1p, instead of DSCP values.
VLAN priority tag iSCSI ows are assigned by default to dot1p priority 4 without
the remark setting.
DSCP None: user-congurable.
Remark Not congured.
iSCSI session aging time 10 minutes
iSCSI optimization target ports iSCSI well-known ports 3260 and 860 are congured as default
(with no IP address or name) but can be removed as any other
congured target.
iSCSI session monitoring Disabled. The CAM allocation for iSCSI is set to zero (0).
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iSCSI Optimization