If there is a problem with one of the disks on which a mirrored volume resides, make sure that the disk is properly connected, and then try to bring back that disk online by first using Rescan. If Rescan does not work, then use the Reactivate Disk command. In most cases, Reactivate Disk brings the disk online and all of the volumes are healthy.

However, if any of the mirrors of the mirrored volume are still not healthy, you may need to resynchronize the degraded volume with the Reactivate Volume command. Resynchronizing makes the data consistent on all mirrors of a mirrored volume.

Right-click the volume and select Reactivate Volume from the context menu.

The mirrored volume should come back to a Healthy state unless there is a serious problem with the volume.

See also the following topics: