278 | iSCSI Optimization
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• iSCSI QoS—A user-configured iSCSI class of service (CoS) profile is applied to all iSCSI traffic.
Classifier rules are used to direct the iSCSI data traffic to queues that can be given preferential QoS
treatment over other data passing through the switch. Preferential treatment helps to avoid session
interruptions during times of congestion that would otherwise cause iSCSI packets to be dropped.
• iSCSI DCBX TLVs are supported.
Figure 15-1 shows iSCSI optimization between servers and a storage array in which a stack of three MXL
Switches connect installed servers (iSCSI initiators) to a storage array (iSCSI targets) in a SAN network.
iSCSI optimization running on the master MXL switch is configured to use dot1p priority-queue
assignments to ensure that iSCSI traffic in these sessions receives priority treatment when forwarded on
stacked switch hardware.
Figure 15-1. iSCSI Optimization Example
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