User`s guide

ADD UNIT
WRITE_PROTECT
NOWRITE_PROTECT (Default)
Enables and disables write protection of the unit.
WRITEBACK_CACHE
NOWRITEBACK_CACHE (Default)
Enables and disables the controller’s write-back cache on this unit.
Note
It may take up to 5 minutes to flush unwritten data from the write-back
cache once you disable write-back caching.
Note
When initially added, NOWRITEBACK_CACHE is the default.
Qualifiers for a Unit Created from a RAIDset
MAXIMUM_CACHED_TRANSFER= n
MAXIMUM_CACHED_TRANSFER=32 (Default)
Specifies the maximum size transfer in blocks to be cached by the controller. Any
transfers over this size are not cached. Valid values are 1–1024.
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
B–22 Command Line Interpreter