iSCSI Commands 237
iscsi cos
The iscsi cos Global Configuration mode command sets the quality of service profile that will be applied
to iSCSI flows. Use the no form of this command to return to default.
Syntax
•
iscsi cos
{vpt
vpt
| dscp
dscp
} [
remark
]
• no iscsi cos
•
vpt/dscp
— The Virtual Priority Tag (VPT) or DSCP to which the iSCSI frames are assigned.
•
remark
— Mark the iSCSI frames with the configured VPT/DSCP when egressing the switch.
Default Configuration
This command has no default configuration.
Command Mode
Global Configuration mode.
User Guidelines
• iSCSI flows are assigned by default with a VPT/DSCP mapped to the highest queue not used for stack
management or Voice VLAN (if mapping not changed by the user). The user should also take care of
configuring the relevant (VPT to queue/DSCP to queue) table in order to complete the setting.
• Setting the VPT/DSCP sets the QoS profile, which determines the egress queue to which the frame is
mapped. The switch default setting for egress queues scheduling is strict priority. The downside of
strict priority is that, in certain circumstances (under heavy high priority traffic), other lower priority
traffic may get starved. In WRR the queue to which the flow is assigned to can be set to get the
required percentage. The user must complete the QoS setting by configuring the relevant ports to
work in WRR mode with the adequate weights.
Example
The following example sets the quality of service profile that will be applied to iSCSI flows.
iscsi aging time
The iscsi aging-time Global Configuration mode command sets aging time for iSCSI sessions. Use the
no form of this command to cancel aging.
Console (config)# iscsi cos vpt 5
remark
5400_CLI.book Page 237 Wednesday, December 17, 2008 4:33 PM
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