User`s guide

ManualsBrandsDigital Equipment Corporation ManualsHome building and DecorStorage Works

361

362

363

364

365

366

367

368

369

370

ADD UNIT

Note

When initially added, NOWRITEBACK_CACHE is the default.

Qualiﬁers for a Unit Created from a TRANSPORTABLE Optical Drive

MAXIMUM_CACHED_TRANSFER=

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

second controller will inherit any PREFERRED_PATH settings, and the

two controllers will operate using the preset PREFERRED_PATH options.

READ_CACHE (Default)

NOREAD_CACHE

Enables and disables the controller’s read cache on this unit.

RUN (Default)

NORUN

Enables and disables a unit’s availibility to the host. When RUN (default) is

speciﬁed, the devices that make up the unit will be spun up and the unit will be

made available to the host. If NORUN is speciﬁed, the devices that make up the

unit will still be spun up, but the unit will not be made available to the host.

B–20 Command Line Interpreter