User`s guide

ADD UNIT
Supported tape formats are as follows:
• DEVICE_DEFAULT (default)
The default tape format is the default that the device uses, or, in the case of
devices that can be set via switches on the front panel, the settings of those
switches.
• 800BPI_9TRACK
• 1600BPI_9TRACK
• 6250BPI_9TRACK
• TZ85
• TZ86
• TZ87_NOCOMPRESSION
• TZ87_COMPRESSION
• DAT_NOCOMPRESSION
• DAT_COMPRESSION
• 3480_NOCOMPRESSION
• 3480_COMPRESSION
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.
Command Line Interpreter B–25