HP 5300 - Manual (Page 52)

Configuring an Array
7-10 HP Smart Array 5300 Controller User Guide
HP CONFIDENTIAL
Writer: Jennifer Hayward File Name: h-ch7 configuring an array
Codename: SilverHammer Part Number: 135606-005 Last Saved On: 10/8/02 11:15 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).