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How to rebuild a software RAID mirror

Learn how to rebuild a software RAID mirror in Mac OS X.

When you disconnect a disk that’s a slice in a mirrored RAID set and then reconnect it, the disk needs to be rebuilt so it contains the latest data. If you previously enabled the "RAID Mirror AutoRebuild" option in the RAID options dialog when you created the RAID, the disk is rebuilt automatically for you in the background and you do not need to use the steps in this article.

If you did not enable the "RAID Mirror AutoRebuild" option in the RAID options dialog when you created the RAID, you need to rebuild the disk yourself. To rebuild a disk in a mirrored RAID set:

  1. Open Disk Utility.
  2. Select the RAID set, and then click RAID.
  3. Click Rebuild.
Important: Information about products not manufactured by Apple is provided for information purposes only and does not constitute Apple’s recommendation or endorsement. Please contact the vendor for additional information.
Last Modified: May 18, 2012
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  • Last Modified: May 18, 2012
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