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Quality of Service (QoS) Commands
497
ProSafe M4100 and M7100 Managed Switches
Note: SCSI flows are assigned by default to the highest VPT/DSCP
mapped to the highest queue not used for stack management or
voice VLAN. The user should also take care of configuring the
relevant Class of Service parameters for the queue 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 Weighted Round Robin
(WRR).
The user might complete the QoS setting by configuring the relevant
ports to work in other scheduling and queue management modes via
the Class of Service settings. Depending on the platform, these
choices might include strict priority for the queue used for iSCSI
traf
fic. The downside of strict priority is that, in certain circumstances
(under heavy high priority traffic), other lower priority traffic might get
starved. In WRR the queue to which the flow is assigned to can be
set to get the required percentage.
Format iscsi cos traffic-class {vpt <vpt> | dscp <dscp>} [remark]
Mode
traffic-class
vpt/dscp
remark
no iscsi cos
This command is to set the Quality of Service profile of SCSI flows to default.
Format no iscsi cos
Mode
iscsi aging time
The iscsi aging time Global Configuration mode command sets aging time for iSCSI
sessions.
Behavior when changing aging time:
Global Config
Term Definition
The traffic class used for assigning iSCSI traffic to a queue.
The VLAN Priority Tag or DSCP to assign iSCSI session packets.
Mark the iSCSI frames with the configured VPT/DSCP when egressing the switch.
Global Config