Technical data

1–8 HSG80 ACS Solution Software Version 8.6 for Compaq Tru64 UNIX 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. This process is called preferring or preferment.
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