Performance Tuning - Compaq 166207-B21 - Smart Array 5302/32 RAID Controller Reference Manual

System Setup
2. Double-click the ACU icon on the desktop.
3. Select the controller from the drop-down list on the main ACU screen.
4. Select the array.
5. Click Modify in the Array box.
6. Select the drives that are to be used as online spares.
IMPORTANT: The capacity of an online spare should be no less than that of any other drive
in the same array. This must be true of every array that uses that drive as an online spare.
7. Click the Assign Spare to Array button in the lower middle part of the screen.
8. Click Done.
9. Click Settings in the Controller box on the main ACU screen.
10. In the Rebuild Priority box on the Controller Settings screen, select High if
rebuilding data is more important than handling operating system requests. If the
controller should rebuild data only when it is idle, select Low.
11. Click Done.
12. Select Save Configuration from the Controller menu.
13. Select Exit from the Controller menu.

Performance Tuning

There are several ways in which you can optimize the performance of the system:
•
Change the ratio of cache memory allocated to reads and writes.
2-8
CAUTION: Selecting a high rebuild priority results in reduced server
performance while the rebuild is in progress. Selecting a low rebuild priority does
not affect server performance, since rebuilding then occurs only when the server
is idle. However, selecting a low rebuild priority greatly increases the time
required for a rebuild. This extended rebuild time substantially increases the risk
that another drive will fail before the rebuild has finished. If additional drive failure
occurs, fault tolerance may be compromised, and data may be irretrievably lost.
Compaq Advanced Data Guarding Option Software Reference Guide