3–Fibre Channel ConfigurationConfiguring End-to-End CS_CTL QoS85 BK3254601-00 CTherefore, when all three entities support QoS (and it is enabled on the switch andthe target), a default priority value is populated in all FCP_CMND, FCP_DATA,FCP_XFER_RDY, FCP_RSP, and FCP_CONFIRM frames.The following sections describe how to configure end-to-end CS_CTL QoS andchange the default priority levels: Configuring CS_CTL QoS on the Switch Configuring CS_CTL QoS on the Storage Device Changing the QoS Priority LevelsConfiguring CS_CTL QoS on the SwitchTo enable CS_STL QoS on the Brocade SW6510 switch:1. From the switch, issue the following command:root> configurechassisConfigure...2. A list of attributes appear one at a time. After either accepting the default orentering a different value, the next attribute appears. Press ENTER to accept the default for cfgload attributes,Custom attributes, and system attributes. Type y for fos attributes. Type 1 for CSCTL QoS Mode.For example:cfgload attributes (yes, y, no, n): [no]Custom attributes (yes, y, no, n): [no]system attributes (yes, y, no, n): [no]fos attributes (yes, y, no, n): [no] yCSCTL QoS Mode (0 = default; 1 = auto mode): (0..1) [0] 13. Reboot the switch.4. To verify that CS_CTL QoS is enabled, issue the following command:root> configshow -all | grep fos.csctlModeNOTEiQoS must be supported by both the switch and target devices.At the time of publication, CS_CTL QoS has been tested only on theBrocade SW6510 switch with Fabric OS (FOS) version 7.3.0a.
