HP StorageWorks Fabric OS 5.0.0 Command Reference Guide (AA-RW1MA-TE, May 2005)

162 Fabric OS commands

Enables the dynamic load sharing (DLS) option.

Synopsis

dlsset

Availability

admin

Description

Use this command to turn on DLS when a fabric change occurs.

Routing is generally based on the incoming port and the destination domain. This means that all the traffic

coming in from a port (either an E_Port or an Fx_Port) directed to the same remote domain is routed

through the same output E_Port.

To optimize fabric routing, when there are multiple equivalent paths to a remote switch, traffic is shared

among all the paths. Load sharing is recomputed when a switch is booted up or every time a change in

the fabric occurs. A change in the fabric is defined as an E_Port going up or down or an Fx_Port going up

or down.

During load sharing, recomputation, existing routes might be moved to maintain optimal balance. This can

cause momentary frame loss along these routes.

In contrast, if DLS is turned off (using dlsReset), load sharing calculations are used only to place new

routes. Once placed, existing routes are never moved from one output E_Port to another unless the original

output E_Port is no longer a recognized path to the remote domain. Optimal balance is rarely achieved

with this setting.

NOTE: DLS is not supported in certain routing policies. Refer to aptPolicy for more information on

routing policies.

Operands

none

Examples

To enable the dynamic load sharing option: