HP StorageWorks Fabric OS 6.x administrator guide (5697-7344, March 2008)

Fabric OS 6.x administrator guide 209
To force in-order frame delivery across topology changes:
1. Connect to the switch and log in as admin.
2. Enter the iodSet command at the command line.
NOTE: This command can cause a delay in the establishment of a new path when a topology change
occurs; use it with care.
3. To confirm the in-order delivery has been set, issue the iodShow command.
To restore out-of-order frame delivery across topology changes:
1. Connect to the switch and log in as admin.
2. Enter the iodSet command at the command line.
Using dynamic load sharing
The exchange-based routing policy depends on the Fabric OS Dynamic Load Sharing feature (DLS) for
dynamic routing path selection. When using the exchange-based routing policy, DLS is by default enabled
and cannot be disabled. In other words, you cannot enable or disable DLS when the exchange-based
routing policy is in effect.
When the port-based policy is in force, you can enable DLS to optimize routing. When DLS is enabled, it
shares traffic among multiple equivalent paths between switches. DLS recomputes load sharing when a
switch boots up or each time an E_Port goes offline and online, or an EX_Port goes offline.
To check and set DLS:
1. Connect to the switch and log in as admin.
2. Enter the dlsShow command to view the current DLS setting.
One of the following messages appears:
• “DLS is set” indicates that dynamic load sharing is turned on.
• “DLS is not set” indicates that dynamic load sharing is turned off.
• “DLS cannot be changed with current routing policy” indicates that you are using the
exchange-based routing policy and you cannot enable or disable DLS. If you get this message, you
cannot perform <Link>step 3, so you are done with this procedure.
3. Enter the dlsSet command to enable DLS or enter the dlsReset command to disable it.
switch:admin> dlsshow
DLS is not set
switch:admin> dlsset
switch:admin> dlsshow
DLS is set
switch:admin> dlsreset
switch:admin> dlsshow
DLS is not set