User`s guide

SET

unit-number

PREFERRED_PATH=THIS_CONTROLLER

PREFERRED_PATH=OTHER_CONTROLLER

NOPREFERRED_PATH (Default)

Note

The PREFERRED_PATH and NOPREFERRED_PATH qualiﬁers are

valid for HSJ and HSD controllers only. The preferred path for HSZ

controllers is determined by the unit number (the target portion of the

unit number–the hundreds place) speciﬁed on the ADD UNIT command.

Speciﬁes the preferred controller that the unit should be accessed through

(PREFERRED_PATH=) or whether the unit may be accessed through either

controller (NOPREFERRED_PATH).

The preferred path qualiﬁer is used only if both controllers are running in a

dual-redundant conﬁguration. If one controller fails, then all the devices will be

made accessible through the remaining controller, ignoring the preferred path

setting.

When the failed controller is restarted, the drives automatically return to the

controller speciﬁed by the preferred path qualiﬁer.

Note

The PREFERRED_PATH qualiﬁer may be speciﬁed on a single controller,

however, the qualiﬁer will not take effect until a second controller is

added and the two controllers are conﬁgured for dual-redundancy. The

second controller will inherit any PREFERRED_PATH settings, and the

two controllers will operate using the preset PREFERRED_PATH options.

Examples

CLI> SET D1 WRITE_PROTECT NOREAD_CACHE

Sets the write protect and turns off the read cache on unit D1.

CLI> SET T47 DEFAULT_FORMAT=1600BPI_9TRACK

Sets unit T47 to 1600 bpi.

Command Line Interpreter B–91