HP StorageWorks 2000 Series Reference Manual page 41

0–125 – Select a specific number if you want the loop ID to stay the same after
you power down and power up. SMU cannot determine which loop IDs are
available. If the controller cannot get the specified loop ID during the loop
initialization process, it tries to get a soft address.
4. Click Save And Continue.
A message informs you that the new values will be requested the next time the
controller is restarted.
5. Click OK.
When processing is complete, the main Host Port Configuration page is displayed.
6. To see the current and pending values, redisplay the Change FC Loop ID page.
7. Restart the affected RAID controllers as described in "Restarting a Controller" on
page 61.
In an FC storage system, the host port interconnects act as an internal switch to
provide data-path redundancy.
When the host port interconnects are enabled, port 0 on each controller is cross-
connected to port 1 on the other controller. This provides redundancy in the event of
failover by making volumes owned by either controller accessible from either
controller.
When the host port interconnects are disabled, volumes owned by a controller are
accessible from its host ports only. This is the default.
For a single-controller FC system, host port interconnects are always disabled.
For a dual-controller FC system in a direct attach configuration, host port
interconnects are typically enabled — except in configurations where fault tolerance
is not required and the highest performance is required.
For a dual-controller FC system in a switch attach configuration, host port
interconnects are always disabled.
You cannot enable host port interconnects if any host port is set to point-to-point
topology.