Specifications

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Compaq HSG80 Array Controller ACS Version 8.4 Configuration and CLI Reference Guide
PREFERRED_PATH=OTHER_CONTROLLER
PREFERRED_PATH=THIS_CONTROLLER
NOPREFERRED_PATH (Default)
Used only in Windows NT operating systems.
May be set only when dual-redundant controllers are operating in a multiple bus
failover configuration. In a multiple bus failover configuration, the host determines
which controller the units are accessed through. The host’s unit-to-controller settings
always take precedence over the preferred path assigned to units with this switch. The
target ID numbers assigned with the SET controller PORT_1_ALPA= (or PORT_2)
command determines which target ID number the controller uses to respond to the
host.
NOTE: When the controllers are configured to operate in transparent-failover
mode, if you set the PREFERRED_PATH switch with the ADD UNIT or SET unit-
number command, an error message displays because you can only assign a
preferred controller path at the unit level only when in multiple bus failover mode.
When no preferred path is assigned, the unit is targeted through the controller which
detects the unit first after the controllers start.
Select PREFERRED_PATH=THIS_CONTROLLER to instruct “this controller” to
bring the unit online.
Select PREFERRED_PATH=OTHER_CONTROLLER to instruct the “other
controller” to bring the unit online.
See Chapter 2 for information regarding multiple bus failover.
READ_CACHE (Default)
NOREAD_CACHE
Switches enable or disable the read-cache function for the unit.