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RAIDWatch User’s Manual
7.3 Controller
“Controller” here refers to the RAID controller unit, which is the main
processing unit of a RAID subsystem. The configuration window contains
two sub-windows: “Caching” and “Controller Parameters.” To configure the
controller’s caching behaviors, select an appropriate value from each of the
pull-down menus, as shown in Figure 7-3.
Figure 7-3: The Controller Page
The data cache can be configured for optimal I/O performance using the
following variables:
Caching Parameters
Write-Back Cache
Enabled, Host Writes are cached before being distributed to
hard drives. This improves write performance but requires
battery backup support to protect data integrity in case of a
power outage.
Disabled, Cache Write-Through. Used primarily if no cache
battery backup is installed and if there is increased likelihood of
a power failure.
Default. This value is considered as a “Not-specified” option. If
set to default, the subsystem’s caching mode will be
automatically adjusted especially when the event triggered
operation has been configured. For example, if a cooling module
7-4 Controller
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