HP StorageWorks 8/80 Brocade Fabric OS Command Reference Guide v6.1.0 (53-1000 - Page 63

aptPolicy 2 aptPolicy Changes or displays the Advanced Performance Tuning (APT) policy. Synopsis aptpolicy [ap_policy] aptpolicy -ap Description Use this command to manage advanced performance tuning (APT) policies on a switch or chassis. Several internal performance tuning parameters can be modified with this command. The default parameters (AP shared Link Policy) are optimized for most SAN applications; in most environments, there is no need to modify the default policy. Notes The switch must be disabled before using this command to change the current policy. Changes take effect immediately for all EX/VEX_Ports after the switch is re-enabled. For details on performance-tuning, refer to the Fabric OS Administrator's Guide. The execution of this command is subject to Admin Domain restrictions that may be in place. Refer to chapter 1, "Understanding Admin Domain Restrictions" and Appendix A, "Command Availability" for details. Operands When invoked without arguments, this command displays the current list of advanced performance tuning (APT) policies supported on this switch, as well as the current policy. This command has the following operand: ap_policy Specifies the APT policy. The following polices are supported: 1 Port-based routing policy. With this policy, the path chosen for an ingress frame is based on: • Ingress port on which the frame was received • Destination domain for the frame The chosen path remains the same if Dynamic Load Sharing (DLS) is not enabled. If DLS is enabled, then a different path might be chosen on a fabric event. Refer to dlsSet for the definition of a fabric event. This policy may provide better ISL utilization when there is little or no oversubscription of the ISLs. Note that static routes are supported only with this policy. 3 Exchange-based routing policy (default). With this policy, the path chosen for an ingress frame is based on: • Ingress port on which the frame was received • FC address of the source fabric device (SID) for this frame • FC address of the destination fabric device (DID) for this frame • FC Originator Exchange ID (OXID) for this frame This policy allows for optimal utilization of the available paths as I/O traffic between different (SID, DID, OXID) pairs can use different paths. All frames received on an ingress port with the same (SID, DID, OXID) parameters takes the same path unless there is a fabric event. Refer to dlsSet for the definition of a fabric event. Fabric OS Command Reference 37 53-1000599-02