HP 226593-B21 Smart Array 5i Plus Controller and Battery Backed Write Cache En - Page 45

Create Drive Array Screen

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Configuring an Array The settings that you use 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 setting determines 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). NOTE: If you optimize the Accelerator Ratio setting, you may also want to change the Stripe Size setting. See the "Create Logical Drive Screen" section and Table 7-2 and Table 7-3 for details. Create Drive Array Screen To display this screen, click Create Array in the Controller box (Figure 7-6) on the ACU Main Configuration screen. The left panel of the Create Drive Array screen shows all drives that are attached to the controller that was selected on the ACU Main Configuration screen. Compaq Smart Array 5i Plus Controller and Battery Backed Write Cache Enabler User Guide 7-11

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Configuring an Array
Compaq Smart Array 5i Plus Controller and Battery Backed Write Cache Enabler User Guide
7-11
The settings that you use 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
setting determines 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).
NOTE:
If you optimize the
Accelerator Ratio
setting, you may also want to change the
Stripe
Size
setting. See the “Create Logical Drive Screen” section and Table 7-2 and Table 7-3 for
details.
Create Drive Array Screen
To display this screen, click
Create Array
in the
Controller
box (Figure 7-6) on the
ACU Main Configuration
screen. The left panel of the
Create Drive Array
screen
shows all drives that are attached to the controller that was selected on the
ACU
Main Configuration
screen.