HP StorageWorks 2/16V Brocade Fabric OS Command Reference Manual - Supporting - Page 69

aptPolicy 2 aptPolicy Changes or displays the Advanced Performance Tuning (APT) policy. Synopsis aptpolicy [policy] Description Use this command to change the performance algorithm on the switch. Several internal parameters are changed by the use of this command, and a detailed performance-tuning discussion is beyond the scope of this manual. The default parameters are optimal for most SAN applications; typical customers do not need to use this command. When used with no arguments, this command displays a list of APT policies supported on this switch, as well as the current policy. This can be done at any time. The switch must be disabled before using this command to change the current policy. The execution of this command is subject to Admin Domain restrictions that may be in place. Operands This command has the following operand: policy Specifies the new 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) feature 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 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 SID for this frame • FC address of the 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 a 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. This policy does not support static routes. DLS always is enabled and the DLS setting cannot change with this policy. Examples To display the current policy: switch:admin> aptpolicy Fabric OS Command Reference Manual 37 53-1000436-01