Digital Equipment HSZ40, Reference Manual

Page: 31 / 118

ADD UNIT 2–19
HSZ40 Array Controller CLI Reference Manual
Select
NORUN
to make a unit unavailable to the host and to cause any user data for that unit
to be flushed from the write-back cache to the disk drives. The devices that make up the
unit are still spun up.
Select
RUN
to make a unit available to the host.
__________________________ Note _____________________________
The RUN and NORUN switches cannot be specified for partitioned units.
____________________________________________________________
WRITE_PROTECT
NOWRITE_PROTECT (Default)
__________________________ Note _____________________________
Write protect disables the writing of any new data by the host. However, the
controller may still write to a write-protected RAIDset to satisfy a reconstruct
pass or to reconstruct a newly replaced member.
____________________________________________________________
The
WRITE
_
PROTECT
switch allows you to ensure that data on a unit is not overwritten.
Select
WRITE
_
PROTECT
to prevent write operations to the unit.
Select
NOWRITE
_
PROTECT
to allow both reads and writes to the unit.
WRITEBACK_CACHE
NOWRITEBACK_CACHE (Default)
__________________________ Note _____________________________
W
RITEBACK
_
CACHE
requires that write-back cache modules be installed in the
subsystem and that the licensed feature be enabled through FLS.
____________________________________________________________
The
WRITEBACK
_
CACHE
switch allows you to enable or disable the use of write-back cache
with a unit.
Select
WRITEBACK
_
CACHE
for all new RAIDsets and mirrorsets, and for all other units for
which you want this feature. The write-back cache improves performance for write
operations to the unit.