Manualshelf

Administrator Guide

ManualsBrandsDell ManualsAccess PlatformsPowerSwitch N1500 Series
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iSCSI Optimization 575
can be removed from monitoring. A target name can also be associated with a
configured target TCP port entry. The maximum number of iSCSI sessions is
1024.
How Is Quality of Service Applied to iSCSI Traffic Flows?
The iSCSI CoS mode is configurable and controls whether CoS queue
assignment and/or packet marking is performed on iSCSI traffic. When the
iSCSI CoS mode is enabled, the CoS policy is applied to packets in detected
iSCSI sessions. When the iSCSI CoS mode is disabled, iSCSI sessions and
connections are detected and shown in the status tables, but no CoS policy is
applied to packets.
When iSCSI CoS mode is enabled, iSCSI login sessions up to the switch
limits are tracked, and data packets for those sessions are given the configured
CoS treatment. iSCSI sessions in excess of the switch limits are not given the
configured CoS treatment; therefore, it is not advisable to exceed the iSCSI
session limit. Multiple connections within a session are counted against the
session limit, even though they show in the session table as a single session.
In the switch, iSCSI connections are aged out using the session aging timer. If
the connection has no detected data packets during the timeout period, the
connection is deleted from the switch internal session table. When all
connections associated with a session age out or disconnect, the session is
deleted.
Whether the iSCSI optimization feature uses the VLAN priority or IP DSCP
mapping to determine the traffic class queue is configurable. By default,
iSCSI flows are assigned to the highest VLAN priority tag or DSCP value
mapped to the highest queue not used for stack management or voice VLAN.
Use the classofservice dot1p-mapping command or the Quality of Service
Class of Service
Mapping Table Configuration page to configure the
relevant Class of Service parameters for the queue in order to complete the
setting.
Whether iSCSI frames are remarked to contain the configured VLAN priority
tag or the IP DSCP value when forwarded through the switch is configurable.