Dell POWEREDGE M1000E - Manual (Page 80)

48 Fabric OS Command Reference
53-1001764-02
aptPolicy
2
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.
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.
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.