Dell Brocade 6520 Command Reference Supporting Fabric OS v7.1.0 - Page 84

2 aptPolicy aptPolicy Changes or displays the Advanced Performance Tuning (APT) policy. SYNOPSIS aptpolicy [policy] aptpolicy -ap [ap_policy] DESCRIPTION NOTES OPERANDS Use this command to display and change the advanced performance tuning (APT) policies on a switch. 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. Distributed path selection (DPS) is supported in logical fabrics. APT policy settings affecting the DPS behavior can be configured per logical switch, and settings apply to the partition for which they are set. Note that policy settings for the base switch or any switch in the base fabric affect all traffic going through the base fabric including any logical fabric traffic that uses the base fabric. In a logical fabric environment, Link Policy settings (aptpolicy -ap) apply only to the base switch and can be executed only on the base switch. When invoked without arguments, this command displays the APT policies supported on this switch, as well as the current policy. You must disable the switch 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 Virtual Fabric or Admin Domain restrictions that may be in place. Refer to Chapter 1, "Using Fabric OS Commands" and Appendix A, "Command Availability" for details. This command has the following operands: 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 both of the following items: • The ingress port on which the frame was received. • The destination domain for the frame. The chosen path remains the same if Dynamic Load Sharing (DLS) is not enabled. If DLS is enabled, a different path may be chosen for a fabric event. Refer to dlsSet for a 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. 2 Device Based Routing Policy (FICON support only). Device-based routing is supported in FICON environments only. With this policy, the path chosen for an ingress frame is based on the following items: • The ingress port on which the frame was received. • The FC address of the source fabric device (SID) for this frame. • The FC address of the destination fabric device (DID) for this frame. 56 Fabric OS Command Reference 53-1002746-01