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Compaq HSZ80 Array Controller ACS Version 8.3 Configuration and CLI Reference Guide
READAHEAD_CACHE (Default)
NOREADAHEAD_CACHE
Enables the controller to keep track of read I/Os. If the controller detects sequential
read I/Os from the host, it will then try to keep ahead of the host by reading the next
sequential blocks of data (those the host has not yet requested) and put the data in
cache. This process is sometimes referred to as prefetch. The controller can detect
multiple sequential I/O requests across multiple units.
Read ahead caching improves host application performance since the data will be read
from the controller cache instead of disk. Read ahead caching is the default for units.
If you do not expect this unit to get sequential I/O requests, select
NOREADAHEAD_CACHE for the unit.
RUN (Default)
NORUN
Controls the unit’s operation and availability to the host.
Specify RUN to make a unit available to the host.
Specify NORUN to make a unit unavailable to the host and to cause any data in cache
to be flushed to one or more drives. NORUN spins down the devices making up a
unit. The drives making up the unit spin down after the data has been completely
flushed.
NOTE: Do not specify the RUN and NORUN switches for partitions.
WRITE_PROTECT (Default)
NOWRITE_PROTECT
Tells the controller whether data contained on the unit can be overwritten.