Dell Brocade G620 Brocade 8.0.1 Fabric OS Administratiors Guide - Page 389
License requirements for QoS, QoS on E_Ports, F_Ports or FL_Ports.
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Optimizing Fabric Behavior CS_CTL-based frame prioritization and QoS zone-based traffic prioritization are mutually exclusive. If you enable CS_CTL-based frame prioritization on F_Ports or FL_Ports, then QoS zone-based traffic prioritization cannot be used between any devices connected to the F_Ports or FL_Ports. CS_CTL-based frame prioritization takes precedence over QoS zone-based traffic prioritization. If you enable CS_CTL-based frame prioritization on F_Ports or FL_Ports that are defined in a QoS zone, CS_CTL-based frame prioritization takes precedence over the QoS zones. The following table shows a basic comparison between CS-CTL-based frame prioritization and QoS zone-based traffic prioritization. Refer to CS_CTL-based frame prioritization on page 398 and QoS zone-based traffic prioritization for detailed information about each type of prioritization scheme. TABLE 75 Comparison between CS_CTL-based and QoS zone-based prioritization CS_CTL-based frame prioritization QoS zone-based traffic prioritization Must be manually enabled. Automatically enabled. No zones are required. Enabled on F_Ports or FL_Ports. Takes precedence over QoS zone-based traffic prioritization. Requires you to create QoS zones. Enabled on E_Ports. Is overridden by CS_CTL-based frame prioritization. Priority is defined by CS-CTL field in frame header. Priority is defined by name of QoS zone. Prioritization is on a frame-basis. Setup steps: ∙ Enable CS_CTL mode on F_Ports or FL_Ports. ∙ Ensure that the CS_CTL mode-enabled host and storage are zoned together. Prioritization is on a flow-basis. Setup steps: ∙ Create QoS zones with host/target members. ∙ Add the QoS zones to the zone configuration. ∙ Save and then enable the zone configuration. ∙ Enable QoS on E_Ports. License requirements for QoS Starting in Fabric OS 7.2.0, QoS does not require the Adaptive Networking license to be explicitly installed. This license is automatically enabled for new switches and for existing switches that are upgraded to Fabric OS 7.2.0 or later. If you upgrade to Fabric OS 7.2.0 and you did not previously have an Adaptive Networking license, then all ports that had QoS mode set to AE (automatically enabled) and were not using the QoS feature are automatically set to OFF after the upgrade. QoS on E_Ports In addition to configuring the hosts and targets in a zone, you must also enable QoS on individual E_Ports that might carry traffic between the host and target pairs. Path selection between the "host,target" pairs is governed by FSPF rules and is not affected by QoS priorities. For example, in the following figure, QoS should be enabled on the encircled E_Ports. NOTE By default, QoS is enabled on 8-Gbps or higher ports. QoS is disabled by default on all long-distance ports. Brocade Fabric OS Administration Guide, 8.0.1 53-1004111-02 389
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