Configuring System Information 207Optimizing iSCSIiSCSI is a communication protocol used for sending data between file servers and storage disks. The fileservers are called initiators and the disks are called targets. You can optimize iSCSI flow by setting Qualityof Service frame priority parameters in the device. The device can also intercept iSCSI frames and provideinformation about iSCSI communications (called sessions).Configuring iSCSI Global ParametersThe iSCSI Optimization Global Parameters page includes parameters that affect how the device handlesiSCSI frames.iSCSI can be configured for QoS. In the iSCSI Optimization Global Parameters page, you must enableiSCSI, set its classification to CoS or DSCP, and enable Remark (user priority). In the QoS pages, you canthen set the queueing to strict priority or WRR, and then map the CoS or DSCP to the desired queue. You setthe queueing in the Qos Queue Settings page, and you map to queues in the QoS CoS to Queue or DSCPto Queue pages.Be careful when setting QoS parameters. For example, if you set the queueing to WRR and set a low weight,iSCSI traffic will be dropped whenever there is an overload.To open the iSCSI Optimization Global Parameters page, click System → iSCSI Optimization→ GlobalParameters in the tree view.Figure 6-94. Global Parameters• iSCSI Status — Whether iSCSI Optimization is enabled on the device. The default value is enabled.• Classification — Whether priority of iSCSI packets is determined by CoS or DSCP. Select theclassification and then choose the desired value.• Remark — Whether iSCSI remarks are enabled on the device.• iSCSI Aging Time — How long the device will wait after the last received frame of an iSCSI sessionbefore deleting the session from the list.
