# Marking a Drive as a Missing Drive

If a drive is currently part of a redundant configuration and if the drive is displaying signs of failure, you can mark the drive as missing and start rebuilding data on that drive.

1. Navigate to the Controller dashboard and select Drive Groups.
2. Click a drive group name (for example, DG_1).
3. Click the icon that corresponds to a drive group to display its contents.
   The virtual drives and physical drives associated with the selected drive group appear.
4. Click the Physical Drive tab, and select a drive which you want to mark as missing.
5. Select Actions > Mark Drive Offline.
   A confirmation dialog appears.
6. Select Confirm and click Yes, Mark Drive Offline to proceed towards marking the drive offline.
   The drive is marked as offline as shown in the following figure.
7. Navigate to the Drives tab and expand the Configured Drives section to see the drives that are offline.
8. Select a drive whose status is offline and go to Actions > Mark Drive as Missing.
9. Navigate to the Drives tab.
10. Select an Unconfigured Good drive from the list of Unconfigured Good drives, and go to Actions > More Actions > Replace Missing Drive.

    The Replace Missing Drive dialog appears.

11. Select the drive and click Replace Missing Drive.
12. Navigate to the Drive Groups tab and select a new drive.
13. Click Actions > More Actions > Start Rebuild.

Parent topic: Managing Physical Drives