User guide

5-30 Compaq StorageWorks RAID Array 4100 User Guide
Drive Rebuild, Expand Priority, and Accelerator
Ratio
To set the drive rebuild priority, expand priority, or accelerator ratio for a
controller, highlight the controller at the Main Configuration View screen and
select the Controller Settings option listed below Controller Options. The
Controller Settings screen appears (Figure 5-26).
Figure 5-26. Controller Settings screen
Drive Rebuild
Drive rebuild occurs after a physical drive fails and is replaced. Only logical
drives configured for fault tolerance (RAID 1, RAID 4, or RAID 5) on the
array with the failed physical drive will rebuild.
Priority Settings
To set the drive rebuild priority, highlight the RA4000 controller and select the
controller settings. If you chose low priority for drive rebuild, drive rebuilding
takes place when there is no I/O to the drive. If you choose high priority, drive
rebuilding occurs faster, at the expense of normal I/O operations. Choosing
high priority for drive rebuilding protects an array, but the array is vulnerable
to additional drive failures while a drive is being rebuilt.