566 | iSCSI Optimization
www.dell.com | support.dell.com
Enabling and Disabling iSCSI Optimization
If iSCSI is enabled, flow control will be automatically enabled on all interfaces. To disable the flow control
on all interfaces, enter the command “no flow control rx on tx off” and save the configuration. To disable
iSCSI optimization, which can turn on flow control again on reboot, enter the command “no iscsi enable”
and save the configuration.
When you enable iSCSI on the switch, the following actions occur:
• Link-level flow 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 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 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 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.
Default iSCSI Optimization Values
Table 26-1 shows the default values for the iSCSI optimization feature.
Note: iSCSI monitoring is disabled by default. iSCSI auto-configuration and auto-detection is enabled by
default.
Note: By default, CAM allocation for iSCSI is set to 0. This disables session monitoring.
Table 26-1. iSCSI Optimization: Default Parameters
Parameter Default Value
iSCSI Optimization global setting Enabled
iSCSI CoS mode (802.1p priority queue
mapping)
Enabled: dot1p priority 4 without remark setting
iSCSI CoS Packet classification iSCSI packets are classified by VLAN instead of by DSCP values.
To Next Page
Loading...
