Brocade Fabric OS Command Reference Manual Supporting Fabric OS v6.3.0 (53-1001337-01, July 2009)

46 Fabric OS Command Reference

53-1001337-01

aptPolicy

Changes or displays the Advanced Performance Tuning (APT) policy.

Synopsis aptpolicy [policy]

aptpolicy -ap [ap_policy]

Description 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.

When invoked without arguments, this command displays the APT policies supported on this

switch, as well as the current policy.

Notes 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.

Operands 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.

3 Exchange-based routing policy (default). With this policy, the path chosen for

an ingress frame is based on all of 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.

• The FC Originator Exchange ID (OXID) for this frame.