Compaq HSZ80 manual ADD Unit D102 DISK10000 PREFERREDPATH=THISCONTROLLER

5–33

Specify WRITEBACK_CACHE for all new RAIDsets, mirrorsets, and units you want to take advantage of the controller’s write-back caching feature. 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 five minutes to flush data contained within the write-back cache when you specify the NOWRITEBACK_CACHE switch.

Examples

This example shows how to create unit D102 from a single-disk drive named DISK10000 and sets the host’s access to the unit through “this controller”:

ADD DISK DISK10000 1 0 0 INITIALIZE DISK10000

ADD UNIT D102 DISK10000 PREFERRED_PATH=THIS_CONTROLLER

This example shows how to create unit D107 from a RAIDset named RAID9 and instructs the unit to take advantage of the controller’s write-back caching feature.

ADD DISK DISK10100 1 1 0

ADD DISK DISK20100 2 1 0

ADD DISK DISK30100 3 1 0

ADD DISK DISK40100 4 1 0

ADD RAIDSET RAID9 DISK10100 DISK20100 DISK30100 DISK40100

INITIALIZE RAID9

ADD UNIT D107 RAID9 WRITEBACK_CACHE

Compaq HSZ80 Array Controller ACS Version 8.3 Configuration and CLI Reference Guide