HP Array Controller HSG V8.7 Software - Manual (Page 304)

B–32 HSG80 User’s Guide
WRITE_PROTECT (Default)
NOWRITE_PROTECT
Tells the controller whether data contained on the unit can be
overwritten.
Specify WRITE_PROTECT to prevent the host from writing data to the
unit. However, the controller may still write to a write-protected
RAIDset to complete a reconstruct operation and metadata, reconstruct
data, and copy data may still be written to RAIDsets and mirrorsets.
Specify NOWRITE_PROTECT to allow the host to write data to the
unit. This allows the controller to overwrite existing data.
NOWRITE_PROTECT is the default for transportable disks.
WRITEBACK_CACHE (Default)
NOWRITEBACK_CACHE
Enable or disable the write-back data caching function of the controller.
The controller’s write-back caching feature improves write
performance. WRITEBACK_CACHE is the default on transportable
disks.
Specify WRITEBACK_CACHE for all new RAIDsets, mirrorsets, and
units you want to take advantage of the controller’s write-back caching
feature.
Specify NOWRITEBACK_CACHE for units you want to receive data
directly from the host without being cached.
Caution Though there is built-in redundancy to protect data contained
in cache, allowing data to be written to write-back cache may result in
the loss of data if a catastrophic subsystem failure occurs.
Note The controller may take up to five minutes to flush data
contained within the write-back cache when you specify the
NOWRITEBACK_CACHE switch.