Configuring an Array
7-10
Compaq Smart Array 5300 Controller User Guide
COMPAQ CONFIDENTIAL
Writer: John Turner File Name: h-ch7 configuring an array.doc
Codename: SilverHammer Part Number: 135606-004 Last Saved On: 7/22/02 10:58 AM
Secondary Screens
Controller Settings Screen
To display this screen, click
Settings
in the
Controller
box (Figure 7-6) on the main
ACU screen.
This screen allows you to set the rebuild priority, expand priority, and accelerator
read/write ratio.
Figure 7-9: Controller Settings screen
The settings that you select for
Rebuild Priority
and
Expand Priority
will not affect
the performance of an idle system. However, they will affect performance on a busy
system:
•
On the
High
settings, the controller will give preference to the rebuild or
expansion process over normal I/O operations.
•
On the
Low
settings, the controller will rebuild or expand only when the
controller is idle. However, this setting leaves the array vulnerable to drive
failure for a longer time than the
High
setting.
The
Accelerator Ratio
settings determine the amount of memory allocated to the
read and write caches. Some applications may perform better with a larger write
cache; others may perform better with a larger read cache. If your controller does not
have a battery-backed array accelerator, only read cache will be available (the ratio
will always be 100% Read / 0% Write).
