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5–134 CLI Commands
Specify WRITE_PROTECT to prevent host write operations to the unit. However, the
controller may still write to a write-protected RAIDset to satisfy a reconstruct pass or
to reconstruct a newly replaced member. Additionally, metadata, reconstruct, and
copy writes are still allowed 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.
NOWRITEBACK_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. WRITEBACK_CACHE
cannot be enabled on units with an underlying DT_SUPPORT mirrorset container.
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 the controller fails.
NOTE: The controller may take up to 5 minutes to flush data contained within the
write-back cache when you specify the NOWRITEBACK_CACHE switch.