# Changing the rebuild rate

Notes:
  1. This action is supported in bootable-CD mode only.
  2. This action is not supported on the integrated RAID controller.

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 Enterprise view, 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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