HP StorageWorks HSG80 ACS Solution Software V8.8 for Sun Solaris Installation and Configuration Guide (AA-RV1RA-TE, March 2005)

Planning a Subsystem
35HSG80 ACS Solution Software V8.8 for Sun Solaris Installation and Configuration Guide
In multiple-bus failover mode, you can specify which units are normally serviced
by a specific controller of a controller pair. Units can be preferred to one controller
or the other by the PREFERRED_PATH switch of the
ADD UNIT (or SET unit)
command. For example, use the following command to prefer unit D101 to “this
controller”:
SET D101 PREFERRED_PATH=THIS_CONTROLLER
Note: This is an initial preference, which can be overridden by the hosts.
Keep the following points in mind when configuring controllers for multiple-bus
failover:
■ Multiple-bus failover can compensate for a failure in any of the following:
— Controller
— Switch or hub
— Fibre Channel link
— Host Fibre Channel adapter
■ A host can redistribute the I/O load between the controllers.
■ All hosts must have operating system software that supports multiple-bus
failover mode.