Brocade Fabric OS Command Reference Manual (53-1000240-01, November 2006)

2-30 Fabric OS Command Reference Manual

Publication Number: 53-1000240-01

aptPolicy

Note: Enter commands in lowercase only; mixed case is for readability.

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.

ote

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:

1. Ingress port on which the frame was received

2. 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:

1. Ingress port on which the frame was received

2. FC address of the SID for this frame

3. FC address of the DID for this frame

4. 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