# Changing the rebuild rate

(Startable-CD mode only.)

Use this action to change the rebuild rate. The rebuild rate determines the rate that the data from a failed physical drive is rebuilt to a new or hot-spare drive.

1. In the tree, click (controller).
2. Right-click Change rebuild rate a rebuild rate. The following choices are available:
   - High
   - Medium
   - Low

When the rebuild rate is High, the rebuild I/O request gets high priority in the controller execution order.

If you change the rebuild rate from High to Medium in a heavily loaded system, the rebuild time can increase but provide better system performance.

If you change the rebuild rate from High or Medium to Low in a moderate to heavily loaded system, the rebuild time can increase, but provide better system performance.

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